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Calculators
For Sale
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The British Calculator Brical money calculating machine, circa 1915

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Dating to around 1915, this is a nice example of the relatively rare Brical Money Calculating Machine, complete with its original leather bound blue velvet & silk line case, and two replacement red and white styluses
Engraved on the face 'The British Calculators Ltd, The "BRICAL" for COMPOUND ADDITION, PATENT',with the serial no 27121 on the side.
Made to add £sd cash amounts together, the stylus is inserted at the number desired and then moved clockwise (as indicated by the stamped arrow) to the end of the slot.
This movement of the toothed ring advances the total as seen in the four result windows, and the carry operation between all rings is automatic.
Clearing the calculator is done manually for each toothed ring which has a red tooth as a visual indicator of the zero position. Beginning with the outer ring, the operator slides the red tooth fully clockwise and repeats for each ring working inward.
The calculator is in very good condition and in good working order, although it is missing one of its fasteners on the lid (see photo).
Measuring 133 mm in diameter it's deceptively heavy, weighing just over 600 grams with its case and comes with a copy of a marketing leaflet and a reproduced 10 page green cover booklet 'Book-keeping by Machinery'.

Price Status Code UK P&P Overseas
£170
SC2662 Free £20
Rare 1920's Fowler's Universal Calculator with Bakelite backplate

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Signed 'Fowler's & Co Manchester', this Universal calculator is one of the rarer models with the bakelite backplate instead of the later steel types, and dates to the 1920's.
Numbered 315 it's in full working order and the six scales perform numerous mathematical functions including multiplication, cube roots and and square roots.
The calculator also comes complete with its leather case which is in sound condition, but with a replacement strap, and is accompanied by a modern copy of a 50 page instruction booklet 'Fowlers Universal Calculator'.
Measuring 85mm in diameter and weighing just over 200 grams in its case, it's in good cosmetic condition with only minor chrome loss around the rim.
Fully functional, this is a nice collectors item.

Price Status Code UK P&P Overseas
£145
SC2656 Free £18
Rare 1930s Otis King model K type B cylindrical slide rule calculator

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This is an early example of Otis King's model 'K' type B cylindrical slide rule calculator with black on yellow scales, numbered 414 and 423.
Carrying the serial no D1177, it dates to the 1930s and has clean and legible helical scales enabling numerous mathematical calculations.
The defining characteristics of the type B are the screws that hold the two-part cursor together with the top cap being marked 'Made In England'.
Made by Carbic Limited London, it is in good cosmetic condition, with only minor plating and paint loss the metal casings (see photos).
In good working order it comes in its original black leather case with the Otis King logo in gold print, a 4 page instruction booklet with the 51, Holborn Viaduct address, plus a copy of a marketing leaflet.

Price Status Code UK P&P Overseas
£140
SC2586 Free £18
1930's Double sided Fowlers Textile Calculator, Short Scale Type

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Made specifically for shippers, merchants and salesmen in the cotton, woollen and textile trades, this Fowlers Textile Calculator Short Scale Type calculator was manufactured in Manchester between 1920 and 1940.
This particular example is double sided, having a fixed table of WEFTS, CLOTHS & REEDS on the reverse.
In very good condition, with clean scales and a chip free glass faces, both the dial and pointer rotate smoothly and it also comes in its original brown leather case ,which is in very good condition with 'Fowlers CALCULATOR' impressed on the strap.
Measuring 68mm in diameter and weighing just over 160 grams in its case, it's also accompanied by a modern copy of 40 page booklet titled 'Instructions for the use of The Fowler Textile Calculator', and a general marketing leaflet for other types.

Price Status Code UK P&P Overseas
£125
SC2678 Free £18
Stanley London WW2 brass rolling rule in mahogany case

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This large 24" WW2 brass parallel rolling rule is signed Trade Mark Stanley London, has the serial number B384, along with the military arrow showing it was issued into service.
Dated 1940, it has a central located roller with a locking bolt, and would have been used to plot the headings of ships and designed to roll smoothly over the charts when making course adjustments, lifted by both brass knobs.
It comes in its matching numbered mahogany case, which although a little warped at one end of the lid, is in sound condition and fastened with two brass catches.
An impressive instrument in excellent condition, it weighs just under 2.2 kgs and 3.2kgs in its case which measures 640mm x 100mm overall.

*OVERSEAS DELIVERY
Due to the packed weight being over the Royal Mail International parcel limit, delivery OUTSIDE the UK mainland will be by courier. As courier costs vary significantly by country, this item cannot be purchased through the automated shopping cart, therefore if you wish to purchase, please email us for shipping costs

Price Status Code UK P&P *OVERSEAS
£95
SC2503 Free Email for Costs
Fowlers double sided Vest pocket model Long Scale Calculator with case

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A nice clean example of a Fowler's double sided Long Scale calculator, complete with leather case and a photocopy of an instruction leaflet for similar long scale models.
Known also as a 'Vest pocket' model, these double sided calculators were recommended to Engineers and Draughtsmen for all round purposes as the most comprehensive and accurate pocket calculator ever made.
Measuring 67 mm in diameter and weighing just under 140 grams in its leather case, it's in full working order with clean scales on both faces.

Price Status Code UK P&P Overseas
£115
SC2677 Free £18
Rare 1920's Otis King model K Type A cylindrical slide rule calculator in case

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This is an example of an early Otis King's model 'K' type A cylindrical slide rule calculator with clean legible helical scales, and only minor marks around the bottom 414 scale edge (see photos), the patent no is 183723 with 414 and 423 scales.
The serial number reads 6572 with no prefix letter, showing it to be one of the earliest models dating between 1921-1923 with the key chain loop on the top cap.
In good working order, it comes in its original silk and velvet lined snap shut hard case, which is also in very good condition and reads 'Otis Kings Patent Calculator Carbic Limited 51 Holborn Viaduct, London EC1' inside the lid. It is accompanied by its original set of instruction booklets, which have had some repair to the folds.

Price Status Code UK P&P Overseas
 
SOLD
SC2645    
Early 1900's Fowlers Scientific Publishing Company Calculator

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This is a quite unique circular calculator which first appeared as an article in Fowler’s Mechanical Engineers pocket book of 1898.
Although the calculator was sold through W H Fowler’s Scientific Publishing Company it’s not clear who designed it or where it was made, although it’s widely thought to be of Swiss manufacture.
Fowler’s did not start producing their range of calculators until 1908 and it’s likely some of their designs were based on this first model. Interestingly this particular model was once owned by the general manager of the Avon India Rubber company around the same time, and stayed in the family until 2020 when it was offered to me by his great grandson.
The large milled crown rotates the whole dial, with the side knob controlling the pointer needle, and “SCIENTIFIC PUBLISHING COMPANY, MANCHESTER” is printed on the scale surface.
In good condition, the bevelled glass cover is free from any chips or gouges and the nickel plated case does not have any dents.
The card scales are also very clean and legible and it comes with a reproduced copy of a 4 page instruction leaflet.
A very rare calculator measuring just over 60mm in diameter not including the crown and weighing under 100 grams, it's in full working order and comes in a modern soft pouch for protection.

Price Status Code UK P&P Overseas
 
SOLD
SC2664    
Rare BriCal Weight Adding Machine in original case. Circa 1910

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Dating to around 1910, this is a very rare example of a Brical Weight Adding Machine, complete with its original leather bound blue velvet and silk lined case including two replacement styluses.
Engraved on the face 'British Calculators LTD. THE 'BRICAL' WEIGHT ADDING MACHINE PATENT", and bearing the serial no 28008 on the edge, it was often used for assessing bale weights by cargo inspectors at the docks.
Made to add Lbs, Qtrs, Cwts and Tons up to 500 tons, the stylus is inserted at the number desired and then moved clockwise (as indicated by the stamped arrow) to the end of the slot.
This movement of the toothed ring advances the total as seen in the five result windows, and the carry operation between all rings is automatic.
Clearing the calculator is done manually for each toothed ring which has a red tooth as a visual indicator of the zero position. Beginning with the outer ring, the operator slides the red tooth fully clockwise and repeats for each ring working inward.
The calculator is in very good condition, includes a copy of a general directions leaflet, and is in good working order.
Measuring 16cm in diameter, it's larger than the more common money calculating Bricals and quite heavy, weighing just over 900 grams with its case.

Price Status Code UK P&P Overseas
 
SOLD
SC2655    
1951 Stanley Fullers type 2 spiral slide rule calculator in fitted box.

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This is a 1951 example of a Fullers Spiral Slide Rule type 2 model made by W.F. Stanley.
It's inscribed on the fixed index arm with the serial no '10478 51', the last two digits indicating the year of manufacture.
The outer cylinder tube moves up and down and rotates freely around the inner cylinder, and although there is some minor scuffing and a couple of small pieces missing (see photos), generally the scales are in good condition.
In addition the entire calculator can be disassembled to its constituent parts with exception of the moulded bakelite handle.
Weighing just under 900 grams and measuring 435mm to the base of the grip, it comes in a Stanley Fullers mahogany case which has the brass end plate for the stand rod, although the steel rod is missing.
The box measures 460mm x 120mm x 110mm and is made of mahogany with the rests lined in green felt, and weighs 1780 grams with the calculator inside.
Also included is a photocopied 32 page instruction booklet for Type 1, Type 2 and Fuller-Bakewell models.

Price Status Code UK P&P Overseas
 
SOLD
SC2591    
1970's Otis King Model L type C cylindrical slide rule in leather case

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In full working order, this is an Otis King model 'L' type C cylindrical slide rule calculator with black on white scales. It carries the serial no B2203 and has very clean and scuff free helical scales enabling numerous mathematical calculations, the patent no is 183723 with scale 429 on the bottom and 430 on the top.
Made by Carbic Limited London in the early 1970s, a vintage calculator in excellent cosmetic condition, there is no plating loss on the chrome barrel and the black sleeve retains all its black paint.
In good working order it comes with its original stitched leather case and box, it also has the original 16 page instruction leaflet which is complete and legible, plus a copy of a marketing flyer.

Price Status Code UK P&P Overseas
 
SOLD
SC2625    
1960's Otis King Model L type C cylindrical slide rule in leather case.

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Dating to the mid 1960's, this Otis King model 'L' type C cylindrical slide rule calculator is in superb cosmetic condition, with no plating loss on the chrome barrel and the black sleeve cursor retaining all its black finish.
It carries the serial no Y0507 and has very clean and legible helical scales enabling numerous mathematical calculations, the patent no is 183723 with scale 429 on the bottom and 430 on the top.
In good working order it comes in its original cardboard box, with black leather case and original 8 page instruction leaflet that has the 54 Dundonald Road address.
There is also a copy of a marketing flyer as well as a matching decimal conversion card.

Price Status Code UK P&P Overseas
 
SOLD
SC2588    
Rare 1920's Otis King model L Type A cylindrical slide rule calculator in case

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This example of an early Otis King's cylindrical slide rule calculator has the rarer white on black scales and is in superb condition as can be seen from the photos.
It's a model 'L' type A with very clean legible helical scales and the patent no is 183723 with 429 and 430 scales.
The serial number reads 9889 with no prefix letter, showing it to be one of the earliest models dating between 1921-1923 and has the key chain loop on the top cap.
In good working order, it comes in its original silk and velvet lined snap shut hard case, which is in very good condition and reads 'Otis Kings Patent Calculator Carbic Limited 51 Holborn Viaduct, London EC1' inside the lid.
It will be supplied with the two sets of instructions shown.

Price Status Code UK P&P Overseas
 
SOLD
SC2609    
Rare 1920's Fowler's textile calculator with bakelite backplate and outer case.

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Signed 'Fowler's & Co Manchester Textile type B', this particular calculator is one of the much rarer models with not only the bakelite back plate, but also a bakelite outer case, and dates to the 1920's.
Numbered with a very early serial number 237, it's in full working order and very good condition, the only blemish being a small piece of the bakelite outer case is missing, which for such a rare piece does not detract too much.
Measuring 85mm in diameter and weighing 220 grams in its outer case, this is a rare collectors item that does not come along very often.

Price Status Code UK P&P Overseas
 
SOLD
SC2396    
1960's Otis King Model K type C slide rule calculator in leather case

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A good 1960's working example of a Otis King's model 'K' type C cylindrical slide rule calculator with black on white scales.
It carries the serial no W4294 and the scales are very clean and legible, enabling numerous mathematical calculations, the patent no is 183723 with scale 414 on the bottom and 423 on the top.
Made by Carbic Limited London, in good working order, it comes in its original stitched leather case.
It also has the original 8 page taped instruction leaflet which is worn but legible, plus a copy of a marketing flyer.
A vintage calculator in good cosmetic condition, there is no plating loss on the chrome parts and the black sleeve cursor retains all its black paint.

Price Status Code UK P&P Overseas
 
SOLD
SC2563    
Early "BRICAL" for Compound Addition Calculating Machine serial no B143, circa 1910 in leather case

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Dating to around 1910, this is a fine example of one of the much rarer Brical Money Calculating Machine models, 'THE "BRICAL" For COMPOUND ADDITION. PATENT'. It has a 4th calculating scale arc instead of the usual 3, and the serial number B143 stamped on a brass disc on the back instead of the edge, indicates this is also one of one of the earlier models.
Made to add £sd cash amounts together, the stylus is inserted at the number desired and then moved clockwise (as indicated by the stamped arrow) to the end of the slot. This movement of the toothed ring advances the total as seen in the four result windows, and the carry operation between all rings is automatic.
Clearing the calculator is done manually for each toothed ring which has a red tooth as a visual indicator of the zero position, beginning with the outer ring, the operator slides the red tooth fully clockwise and repeats for each ring working inward.
It comes complete with its original leather bound blue velvet and silk lined case, instruction sheet, and two later replacement styluses.
In very good cosmetic condition and full working order, the calculator measures 130mmm in diameter and is deceptively heavy, weighing just under 650 grams with its case.

Price Status Code UK P&P Overseas
 
SOLD
SC2452    
1921-23 Otis King Model K type A with rare white on black scales calculator

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A fine example of an early Otis King's cylindrical slide rule calculator with the rare white on black scales, along with its original printed box which reads "OTIS KINGS PATENT CALCULATOR - Patentees and Sole Manufacturers. CARBIC LIMITED, 51 HOLBORN VIADUCT, LONDON EC1.
This is a model 'K'  type A and carries the serial no A5103, showing it to be one of the earliest models dating between 1921-1923. Capable of numerous mathematical calculations, all detailed in the original 4 page instruction leaflet, which has been seen a repair and is accompanied by a copy of a marketing flyer.
The patent no is 183723, with scale 414 on the bottom and 423 on the top.
The calculator is in good cosmetic condition aside from some minor plating loss marks on the central steel tube (see photo). However, given the rarity of this calculator and its age these faults do not detract greatly from it's overall appeal.

Price Status Code UK P&P Overseas
 
SOLD
SC2567    
1950's ADDOMETER sterling calculator retailed by Taylors Chancery Lane, London.

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Made by the Reliable Typewriter & Adding Machine Co, USA, and distributed in the UK by Taylor's, 74 Chancery Lane, London, this is a Model F Addometer for English currency made to calculate £sd cash amounts, with 4 dials for £'s, 2 for Shillings and 2 for Pence and Farthings.
First introduced in 1927, it was the first successful dial adder in which the carry mechanism works in both directions.
There is a narrow circular slot with holes around the edge of the dial for putting a stylus in and turning the dial until the stylus hits the end of the slot. Subtraction can be performed directly by turning the dials anti-clockwise, the opposite direction from adding.
The addometer can be cleared to zero by pulling out the tab at the bottom-right corner which also houses a metal stylus for precision control.
Probably dating to the 1950's with serial number 016698, it's in very good condition and in full working order.
It weighs just over 600 grams in its felt lined leather case which measures 300 x70 x 25mm.

Price Status Code UK P&P Overseas
 
SOLD
SC2342    
Rare Pilot Balloon MK IV A Slide Rule in fitted case

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A rare example of a meteorological pilot balloon slide rule MK 5 model dating to the 1960's in its original fitted case with a copy of an instruction leaflet dated August 1950 for the MK IVa version from the Meteorological office, Air Ministry. The rule reads 'PILOT BALLOON SLIDE RULE , MARK 5 MET. REF. 29550 4052/69' with the Met Office symbol.
The plate adorning the case reads 'Pilot Balloon Slide Rule Mark IV A Met. Ref. No. 868 A' and the interior lid reads 'F Troop 73 BTY' written in black pen which I believe relates to its place of issue.
Pilot balloon sliderules rarely come up for sale as the majority were produced mainly for the use of Govenment agencies, consequently very few found their way into private collections.
This is a large slide rule measuring just under 25" in length and weighing just under 1.4 kgs in its wooden case, and as can be seen from the photos is in good condition.

Price Status Code UK P&P Overseas
 
SOLD
SC2570    
1930's Fowler's Universal calculator in presentation case

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This is a fine example of a 1930's Fowlers Universal circular calculator, in a special blue velvet lined presentation case embossed 'The Fowler Calculator' in gold lettering on the lid, along with a photocopied instruction booklet.
In full working order, the six scales perform numerous mathematical functions including multiplication, cube roots and and square roots.
Weighing just over 250 grams in its case, the calculator measures 90mm in diameter has a nice clean dial, and all very good condition including the presentation case.
It has a black hammer finish steel back plate which is free of any blemishes.
Not only is this a collectors item, but also still practical for use today.

Price Status Code UK P&P Overseas
 
SOLD
SC2536    
1960's Otis King Model L type C cylindrical slide rule with original purchase receipt

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In full working order, this is an Otis King model 'L' type C cylindrical slide rule calculator with black on white scales.
It carries the serial no Z3498 and has very clean and legible helical scales enabling numerous mathematical calculations, the patent no is 183723 with scale 429 on the bottom and 430 on the top.
Made by Carbic Limited London in the late 1960's, it's accompanied by it's original purchase receipt from Carbic Limited dated 1969.
A vintage calculator in superb cosmetic condition, there is no plating loss on the chrome barrel and the black sleeve retains all its black paint.
In good working order it comes with its original stitched leather case and box, it also has the original 16 page instruction leaflet which is complete and legible, plus a copy of a marketing flyer.

Price Status Code UK P&P Overseas
 
SOLD
SC2471    
Late 1940's Otis King model K type B cylindrical slide rule calculator

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A good working example of an Otis King's model 'K' type B cylindrical slide rule calculator with black on white scales.
It carries the serial no P2525 and has very clean & legible helical scales enabling numerous mathematical calculations, the patent no is 183723 with scale 414 on the bottom and 423 on the top as well as dual screws holding the frame, typical of type B models.
Made by Carbic Limited London in the late 1940's, it really is in excellent cosmetic condition with the black and chrome sleeve having no paint or plating loss. 
In good working order it comes in its original box and 8 page Dundonald Rd instruction booklet, plus a copy of a marketing leaflet.

Price Status Code UK P&P Overseas
 
SOLD
SC2446    
Late 1950's Otis King Model L type B/C Hybrid cylindrical slide rule & calculator

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This is a 1950's Otis King Model L type B/C hybrid series as indicated by the serial number R3447 and 'Made in London' marked on opposite ends.
Made by Carbic Limited London, the patent no is 183723, with scale 429 on the bottom and 430 on the top, this particular example is in good order with all scales in very clean, legible condition and free of any scuff marks.
Though someone has inscribed the numbers '329' and 'PCB' around the Serial number, the black and chrome body is also in good condition, with only minimal paint loss on the black sleeve.
It comes in its original box and 8 page instruction booklet, plus a copy of a marketing leaflet.
In full working order, the helical scales enable numerous mathematical calculations.

Price Status Code UK P&P Overseas
 
SOLD
SC2434    
Early BriCal Money Calculating machine by T J Marshall circa 1907

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Patented by husband & wife Herbert and Mabel Dickenson in 1905, the BriCal calculator was initially manufactured in partnership with TJ Marshall & Co, before the Dickensons chose to manufacture the units themselves under new a company called British Calculators Ltd in 1907.
This particular example is relatively rare with a serial number of 1361 and is also marked 'T.J.MARSHALL & CO. Mnfrs' indicating it was made between 1906 & 1907.
It comes complete with its original leather bound blue velvet and silk lined hard case and the two original styluses.
Engraved on the face 'The British Calculator, (Model B) For Compound Addition, Patent', it was made to add £sd cash amounts together.
The stylus is inserted at the number desired and then moved clockwise (as indicated by the stamped arrow) to the end of the slot, this movement of the toothed ring advances the total as seen in the four result windows, and the carry operation between all rings is automatic.
Clearing the calculator is done manually for each toothed ring which has a red marker as a visual indicator of the zero position.
In full working order, both calculator and case are in excellent cosmetic condition, and is accompanied by its original direction sheet and the original fac-simile of the General Post Office Warrant used to purchase the calculator dated March 1907.
Stored in a thick card box marked "British Calculater 2-10-9" and measuring 133mm in diameter it's deceptively heavy, weighing just over 700 grams in the box.

Price Status Code UK P&P Overseas
 
SOLD
SC2414    
1930's Fowlers Textile Calculator Short Scale Type in steel case

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A fine example of a Fowlers Textile Calculator Short Scale Type manufactured in Manchester between 1920-1940.
Measuring 65mm in diameter, it comes with the steel backplate hand inscribed P.W.C. with the serial number 16226 and is in full working order.
In very good condition, with clean scales and a chip free glass face, it comes in its original special blue velvet lined presentation case which measures 73mm square, and is hand inscribed P.W.Clark on the back.
There is also a modern velvet drawstring pouch supplied for added protection.

Price Status Code UK P&P Overseas
 
SOLD
SC2027    
Rare 1920s Otis King Model L Type A calculator with 416/417 scales

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This example of an early Otis King's cylindrical slide rule calculator has the rarer white on black scales and is in excellent condition.
The serial number reads 7385 with no prefix letter, showing it to be one of the earliest models dating between 1921-1923 and has the key chain loop on the top cap.
It's a model 'L' type A with clean legible helical scales and the patent no is 183723 with 416 and 417 scales, much less common then the later model Ls which had 429 & 430 scales.
In good working order, it comes in its original silk and velvet lined snap shut hard case, which is in very good condition and reads 'Otis Kings Patent Calculator Carbic Limited 51 Holborn Viaduct, London EC1' inside the lid.
The scarcity of this model cannot be understated, as early Model Ls with 416/417 scales in the white on black design rarely come up for sale.
It will be supplied with duplicate copies of an instruction booklet, plus a marketing leaflet.

Price Status Code UK P&P Overseas
 
SOLD
SC2425    
1940's Fowler's Jubilee Magnum Extra Long Scale calculator
(with original instructions)

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Designed in 1948 by Harold Fowler to mark the 50th anniversary of the founding of the firm by his father William Henry Fowler in 1898, this is the Fowler's Jubilee Magnum Extra Long Scale calculator.
This was the largest circular calculator made by Fowler's measuring 12cm in diameter, and it has a 79" long scale extending over ten circles.
In full working order, it has a black hammer finish steel backplate, and clean legible scales inside a chrome outer body which is in good condition with some chrome loss around the outer edges.
Weighing 400 grams in its leather case which is in good sound condition, it also comes with the original 24 page instruction booklet.

Price Status Code UK P&P Overseas
 
SOLD
SC2391    
Early 1920's Otis King model K calculator with white on black scales.

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This example of an early Otis King's cylindrical slide rule calculator has the rarer white on black scales and is in excellent condition.
The serial number reads 8045 with prefix letter A, showing it to be one of the earlier models dating between 1921-1923, and has the key chain loop on the top cap.
It's a model 'K' type A with clean legible helical scales and the patent no is 183723 with the 414 and 423 scales.
In good working order, it comes in its original silk and velvet lined snap shut hard case, which is in very good condition and reads 'Otis Kings Patent Calculator Carbic Limited 51 Holborn Viaduct, London EC1' inside the lid.
Rare to find in such good condition, it will be supplied with it's original 4 page operating instruction leaflet.

Price Status Code UK P&P Overseas
 
SOLD
SC2405    
1920's Fowler's Type B Textile calculator in leather case with original instruction booklet.

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Made specifically for shippers, merchants and salesmen in the cotton, woollen and textile trades this Fowlers Type "B" Textile Calculator was manufactured during the 1920's.
Measuring 87mm in diameter, it is in very good condition, with clean scales, a polished backplate numbered 2832 and a chip free glass.
Both the dial and pointer rotate smoothly when turning the milled knobs and it also comes in its original brown leather case which is in very good condition with 'FOWLERS CALCULATOR' impressed on the strap.
It is also accompanied by its original red cover instruction booklet which is stamped 53 New Bailey Street, Manchester, England.

Price Status Code UK P&P Overseas
 
SOLD
SC2254    
1960s Otis King Model L type C cylindrical slide rule with helical scales

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Made by Carbic Limited London in the late 1960's, this Otis King cylindrical pocket calculator is a model 'L' type C series.
It has the patent no 183723 with scale 429 on the bottom, & 430 on the top, and is in superb cosmetic condition.
All scales are in clean, legible condition and free of any scuff marks, the black and chrome sleeve body is also in fine condition with no paint or plating loss.
In good working order it comes in its cardboard box, plus the 8 page instruction leaflet with the 54 Dundonald Road address, and a copy of a marketing flyer.
In full working order, with the serial number Z0904, the helical scales enable numerous mathematical calculations, all detailed in the supplied instructions.

Price Status Code UK P&P Overseas
 
SOLD
SC2345    
1960s Otis King Model L type C cylindrical slide rule with helical scales

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Made by Carbic Limited London in the 1960's, this Otis King cylindrical pocket calculator is a model 'L' type C series.
It has the patent no 183723 with scale 429 on the bottom, & 430 on the top, and is in superb cosmetic condition.
All scales are in clean, legible condition and free of any scuff marks, the black and chrome sleeve body is also in fine condition with no paint or plating loss.
In good working order it comes with its original stitched leather case and box, plus the 8 page instruction leaflet with the 54 Dundonald Road address, and a copy of a marketing flyer.
In full working order, with the serial number W4584, the helical scales enable numerous mathematical calculations, all detailed in the supplied instructions.

Price Status Code UK P&P Overseas
 
SOLD
SC2296    
Rare 1920's Fowler's Universal calculator with bakelite backplate.

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Signed 'Fowler's & Co Manchester', this Universal calculator is one of the rarer models with the bakelite backplate instead of the later steel types, and dates to the 1920's.
Numbered 1596 it's in full working order and the six scales perform numerous mathematical functions including multiplication, cube roots and and square roots.
The calculator also comes complete with its leather case, impressed 'Fowlers Calculator' on the retaining case strap and is in sound condition with all stitching intact.
Measuring 85mm in diameter and in excellent cosmetic condition, this is a rare collectors item.

Price Status Code UK P&P Overseas
 
SOLD
SC2267    
1930's Fowlers Vest pocket Long Scale calculator in nickel case

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A nice clean example of a Fowler's double sided Long Scale calculator, contained in its purple velvet lined nickel plated case with the original Fowlers trademark logo on the inside of the lid.
Known also as a 'Vest pocket' model, these double sided calculators were recommended as the most comprehensive and accurate pocket calculator ever made, and this particular model dates to the 1930's.
In very good condition, it measures 2 1/2" diameter and is in good working order, with very clean scales on both faces.
One side reads 'Fowlers Calculator' and the other 'Fowlers Long Scale Calculator' with the serial number 11990.

Price Status Code UK P&P Overseas
 
SOLD
SC2235    
1960's Otis King Model L type C cylindrical slide rule with instructions

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Made by Carbic Limited London in the early 1970's, this Otis King cylindrical calculator is a model 'L' type C series.
It has the patent no 183723 with scale 429 on the bottom, 430 on the top, the serial number B6641, and is in excellent cosmetic condition.
All scales are in clean, legible condition and free of any scuff marks, the black and chrome sleeve body is also in fine condition with no paint or plating loss.
In good working order it comes with its numbered box, and and its original instruction booklet, plus a duplicate of a marketing leaflet.

Price Status Code UK P&P Overseas
 
SOLD
SC2212    
1950s Otis King Model L Type B cylindrical slide rule & calculator

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This Otis King Model L type B dates between 1949-1951 as indicated by the serial number R680 and the accompanying instruction leaflet which has the Seymour place address.
Made by Carbic Limited London, the patent no is 183723 with scale 429 on the bottom and 430 on the top, this particular example is in excellent cosmetic condition as can be seen from the photos.
There is also a sticker on the inside box reading 'Books & Careers 486 Oxford Street London. W1 GROsvener 5664' which was possibly the retailer.
In good working order it comes in its original box with 8 page instruction booklet which aside from some curled pages is also in good condition, plus an additional copy of a marketing leaflet

Price Status Code UK P&P Overseas
 
SOLD
SC2165    
Early 20th century Stanley Fullers Slide Rule dated 1912 with instruction book

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This is a 1912 example of a Fullers Spiral Slide Rule pre-stand model made by W.F. Stanley, complete with an instruction manual.
One of the earlier models it's inscribed on the fixed index arm with the serial no '3217 12', the last two digits indicating the year of manufacture.
The outer cylinder tube moves up and down and rotates freely around the inner cylinder, though there is some minor scuffing to the outer movable cylinder as visible in the photos, the other scales are in good condition with clean legible text. In addition the entire calculator can be disassembled to its constituent parts and the handle can also be unscrewed.
Weighing just over 600 grams, it comes in a later Stanley Fullers mahogany case which has the brass end plate for the stand rod, but this calculator is an earlier pre-stand model although still a good fit.
The box measures 460mm x 120mm x 110mm and is made of mahogany with the rests lined in green felt, and weighs 1460 grams with the calculator inside.
Also included is a later 32 page instruction booklet for Type 1, Type 2 and Fuller-Bakewell models, which is in reasonably good condition, although has minor curling on some pages and light staining

Price Status Code UK P&P Overseas
 
SOLD
SC2177    
Brass navigational rolling rule by J. Halden & Co Manchester.

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Founded by Joseph Halden after his partner A G Thornton left the business in 1878, J Halden & Co (later adding Ltd in 1907) was a manufacturer of drawing and surveying instruments in the Manchester and London areas before being absorbed by the Ozalid Group in 1969.
This early 20th century large solid brass rolling rule measuring 18 inches long weighs just under 1.9kgs and is inscribed J Halden & Co Ltd. Manchester & London.
With a central located roller, this would have been used to plot the headings of ships and designed to roll smoothly over the charts when making course adjustments, lifted by both brass knobs.
It comes in its fitted mahogany case retained by green felt steadiers and is in very good condition, with no splits in the wood and fastened with two 7 shaped brass catches.
A substantial instrument it weighs over 2.7kg in its case which measures 19" x 3.75" overall, hence the high overseas shipping charge.

All buyers please note: due to weight, delivery will be by courier and therefore it is very important that a contact telephone number be entered through the shopping cart at checkout stage.

Price Status Code UK P&P Overseas
 
SOLD
SC2193    
WW2 boxwood scale rules set by F. McCarthy and Son in original box

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This is a WW2 boxwood scale rules set by F. McCarthy and Son in its original box.
Dating to the early 1940s, these sets were used by military intelligence in the creation of technical drawings for the war effort.
There are ten rules in total, five 12" rules and five 2" rules, both sets marked alphabetically from "1A" to "1E" referring to different scales for precision. All are stamped 'F.McC ENGINE DIVIDED' with a military crowsfoot engraved on each.
The box is 345 x 40 x 40 mm and stamped on the lid 'SET No.1, F.McC' and lined with green felt on the interior.

Price Status Code UK P&P Overseas
 
SOLD
SC2141    
Late 1950's Otis King Model K type B/C Hybrid cylindrical slide rule & calculator

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This is a late 1950's Otis King Model K type B/C hybrid series as indicated by the white dimple, with the serial number S6937 and 'Made in England' marked on opposite ends.
Made by Carbic Limited London, the patent no is 183723 with scale 414 on the bottom and 423 on the top, this particular example is in excellent cosmetic condition with the black and chrome sleeve having no paint or plating loss.
In good working order it comes in its original box with 8 page instruction booklet which aside from a small repair on the first page is also in good condition plus an additional copy of a marketing leaflet

Price Status Code UK P&P Overseas
 
SOLD
SC2151    
World War 2 case load adjuster sliderule by Cox & Stevens

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This is a rare WW2 C-715 Aviation military load adjuster slide rule.
Signed 'Case load adjuster, C-715, Cox & Stevens Electronic Scales, Division of Revere Corp of America' on the rule and 'CASE LOAD ADJUSTER C-715 REVERE CORP OF AMERICA. WALLINGFORD, CONN' on the inside flap of the brown leather case in gold lettering.
Load adjuster slide rules were primarily used to calculate the center of gravity on aircraft to ensure cargo was distributed correctly.
The slide rule is complete and in excellent condition, along with it's leather case that measures 13" (330mm), and overall weight is 335 grams.

Price Status Code UK P&P Overseas
 
SOLD
SC2137    
1960's Otis King Model L type C cylindrical slide rule with instructions

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Made by Carbic Limited London in the early 1960's, this Otis King cylindrical calculator is a model 'L' type C series.
It has the patent no 183723 with scale 429 on the bottom, & 430 on the top, with the serial number W0924 and is in excellent cosmetic condition.
All scales are in clean, legible condition and free of any scuff marks, the black and chrome sleeve body is also in fine condition with no paint or plating loss.
In good working order it comes with its numbered box, and the original 8 page instruction booklet, plus a copy of a marketing leaflet.

Price Status Code UK P&P Overseas
 
SOLD
SC2104    
1940's Fowlers Textile calculator type B in presentation case.

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A fine example of a Fowlers Textile Calculator Type B manufactured in Sale during the 1940's. Measuring 87mm in diameter, it comes with the black hammer finish steel backplate, and is in full working order.
In very good condition, with clean scales & a chip free glass face, it comes in its original special blue velvet lined presentation case which measures 120mm x 110mm, along with its original instruction booklet.

Price Status Code UK P&P Overseas
 
SOLD
SC1951    

Muldivo Mentor mechanical pinwheel calculator

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This is a nice condition Muldivo Mentor pinwheel calculator incorporating 10 digit setting register, 16 digit results register, and 8 digit revolution register, also has a back transfer mechanism. Model WSR 160, serial no 224415, made in Germany by Walther, this is a quality calculator, the pinwheel mechanism being machined from brass. Not only a great conversation piece, but an unusual retro piece from the late 1950's which is becoming increasingly difficult to find, particularly in such good condition. In full working order, overall dimensions, 11" x 6", weight around 6kgs, overseas buyers please email for shipping costs.

Price Status Code UK P&P Overseas
  SOLD SC1234    
1960's Otis King Model K type C cylindrical slide rule with instructions

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A good working example of an Otis King's model 'K' type C cylindrical slide rule calculator with black on white scales.
It carries the serial no Z3389 and has very clean & legible helical scales enabling numerous mathematical calculations, the patent no is 183723 with scale 414 on the bottom, & 423 on the top. 
Made by Carbic Limited London in the late 1960's, it really is in excellent cosmetic condition with the black and chrome sleeve having no paint or plating loss. 
In good working order it comes with its box and the 16 page instruction booklet, plus a copy of a marketing leaflet.

Price Status Code UK P&P Overseas
 
SOLD
SC2068    
1930's Fowlers Universal calculator in presentation case with instruction book

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This is a nice condition 1930's Fowlers Universal circular calculator, in a special blue velvet lined presentation case, along with its original instruction booklet.
In full working order, the six scales perform numerous mathematical functions including multiplication, cube roots and and square roots.
The calculator measures 90mm diameter has a nice clean dial, and all is in very good condition including the presentation case.
It has a black hammer finish steel back plate which is free of any dents or blemishes, and is a fine collectors item.

Price Status Code UK P&P Overseas
 
SOLD
SC2065    
Early 1960's Otis King Model L type C cylindrical slide rule with helical scales

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Made by Carbic Limited London in the early 1960's, this Otis King cylindrical calculator is a model 'L' type C series. It has the patent no 183723 with scale 429 on the bottom, & 430 on the top, and is in excellent cosmetic condition.
All scales are in clean, legible condition and free of any scuff marks, the black and chrome sleeve body is also in fine condition with no paint or plating loss.
In good working order it comes with its original box and a duplicate 8 page instruction booklet, plus a copy of a marketing leaflet.
In full working order, with the serial number U3800, the helical scales enable numerous mathematical calculations, all detailed in the supplied instruction booklet.

Price Status Code UK P&P Overseas
 
SOLD
SC2011    
Facit C1-13 mechanical calculator 1961

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A vintage mechanical calculator made by Atvidaberg - Facit in Sweden. The model is the C1-13, this particular design was produced between 1960 - 1964 and the serial number 799433 allows us to date it to 1961. It has a 10 digit keyboard with 8 digit counter and 13 digit accumulator. Cosmetically there are signs of wear and tear, with some paint loss, and a small crack in the results window (see photo 4, the crack is just before the number 3). However, it is in full working order, although the tips of the plastic indicators are missing, but the slides still work and do not affect the operation of the calculator. This is a heavy item at around 6kgs, and measures overall width 11.5" x 7.5"depth x 6" high.

Price Status Code UK P&P Overseas
  SOLD SC686    
Otis King Model L type B/C hybrid with leather case

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This is a 1950's Otis King Model L type B/C hybrid series as indicated by the white dimple, with the serial number R4206 and 'Made in England' marked on opposite ends.
Made by Carbic Limited London, the patent no is 183723, with scale 429 on the bottom and 430 on the top, this particular example is in good order with all scales in very clean, legible condition and free of any scuff marks.
The black and chrome body is also in good condition, with only minimal paint loss on the black sleeve.
It comes in its leather carry case with a duplicate 8 page instruction booklet, plus a copy of a marketing leaflet.
In full working order, the helical scales enable numerous mathematical calculations.

Price Status Code UK P&P Overseas
 
SOLD
SC2013    
1930's Fowlers Universal Calculator in Presentation Case

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A nice condition 1930's Fowlers Universal circular calculator, in a special blue velvet lined presentation case.
In full working order, the six scales perform numerous mathematical functions including multiplication, cube roots and and square roots.
The calculator measures 90mm diameter has a nice clean dial, and all is in very good condition including the presentation case.
It has a black hammer finish steel back plate which is free of any dents or blemishes, and is a good collectors item.

Price Status Code UK P&P Overseas
 
SOLD
SC1979    
Original Odhner pinwheel calculator

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Original Odhner pinwheel mechanical calculator. Grey metal case, made in Sweden, serial no 1049 - 52417. In good condition with only minor paint loss. Dating to around 1960, these are rapidly becoming must have desktop accessories, as well as collectables. In full working order this is a heavy item weighing over 6kgs! Overseas buyers please email for cost of shipping.

Price Status Code UK P&P Overseas
  SOLD SC264    
1930's Fowlers Magnum Long Scale calculator in presentation case & original instructions.

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Dating to the late 1930's, this is the Fowler Magnum Long Scale calculator designed mainly for engineers, and consists of a series of concentric circular scales. It was the largest of the Fowlers range before the Jubilee Magnum came along in 1948.
In very good condition, with clean scales & a chip free glass face, it comes in a special blue velvet lined presentation case, and the original 36 page instruction booklet.
In full working order, it has a chrome backplate which is free of any dents or blemishes, and measures 120mm in diameter.

Price Status Code UK P&P Overseas
 
SOLD
SC1935    
Rare 1920's Fowler's Type H circular slide rule/calculator

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This Type H calculator is one of the rarer models of the Fowlers circular slide rule range, being one of the first of the range of double sided slide rules that Fowlers introduced in the first quarter of the 20th century.
Dating to around 1920 the type H model followed on from the Scientific Publishing Co Fowler’s Patent Pocket Calculator which was patented in 1910.
The calculator measures 68mm in diameter not including the stem & ring, and as can be seen from the photos is in very good cosmetic condition with some minor nibbling on the metal edge, which is only noticeable on close inspection.
The card scales are very clean and legible, and the glass is clear with no chips or damage.
This is a particularly rare calculator numbered 3498 on the outer edge, in good working order and comes in a modern soft pouch for protection.

Price Status Code UK P&P Overseas
 
SOLD
SC1884    
1920's Fowlers Type RX Calculator in original case

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This is one of the rarer models of the Fowlers circular slide rule range.
Patented around 1920 the RX was one of the first range of double sided slide rules that Fowlers made in the first quarter of the 20th century.
Introduced alongside the type R & type H models, it consists of the front dial of each of those and was thought to be a good compromise for both science students and draughtsmen.
The Fowlers RX calculator measures 67mm in diameter not including the stem & ring, and as can be seen from the photos is in good condition.
The card scales are very clean and legible, and the glass is clear with no chips or damage, the serial number 3431 is engraved on the outer edge.
In full working order, it comes with its original nickel plated outer case which although tarnished in places, is in sound condition.

Price Status Code UK P&P Overseas
 
SOLD
SC1889    

Vintage Facit NTK mechanical calculator

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This is a vintage mechanical calculator made by Atvidaberg - Facit in Sweden. The model is the NTK which was produced between 1954 - 1957, and the serial number 473672 allows us to date this particular one to 1955. It has a 10 digit keyboard with 8 digit counter and 13 digit accumulator. In very good condition and fully working, this is a heavy item at around 6kgs, and measures overall width 11.5" x 7.5"depth x 6" high. Overseas buyers please email me for shipping costs.

Price Status Code UK P&P Overseas
  SOLD SC294    
Fowlers Universal calculator - prop used in Celebrity Big brother TV show

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This is a rare opportunity to buy a piece of TV memorabilia with this superb condition Fowlers Universal circular calculator in a special blue velvet lined presentation case, which was used as one of the props in the 5th series of Celebrity Big Brother in 2007.
It featured in the Manor House task and was used as an object of interest by the celebrities in the show which included Jermaine Jackson, Shilpa Shetty, Dirk Benedict and the late Jade Goody.
I supplied a number of vintage and antique instruments for the task through my website, of which this was one directly to Endemol the TV company who produced the programme for Channel 4, and this will come with a copy of the hire agreement which is signed by their representative.
In full working order, the six scales perform numerous mathematical functions including multiplication, cube roots and and square roots.
The calculator measures 9cm diameter has a nice clean dial, and all is in very good condition including the presentation case.
It has a black hammer finish steel back plate which is free of any dents or blemishes, and is a true collectors item with the added interest of having featured in a high profile TV show.

Price Status Code UK P&P Overseas
 
SOLD
SC1838    
Fowlers Twelve Ten circular slide rule with leather case

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This is a fully working Fowler's Twelve Ten calculator in very good condition, dating to the 1930’s or 1940’s. Introduced in 1936, this particular calculator was primarily designed for Architects, Surveyors, Builders and Craftsmen, and is one of the more hard to find models with the chrome back plate. It was known as the 12-10 because it includes scales to convert twelfths to tens, yards to metres, lbs to kgs, inches to centimetres etc., and the two milled adjusting knobs rotate the dial and cursor. The scales are very clean and the dial reads FOWLER’S “ TWELVE – TEN “ PATENT CALCULATOR, Fowler & Co Manchester. In excellent cosmetic condition, the chrome back plate is free of any dents, with no tarnish or chrome loss and the glass front cover is also undamaged. The calculator measures 85mm in diameter, and comes in a leather case which is also in very good condition

Price Status Code UK P&P Overseas
  SOLD SC1636    
Large Fowlers Magnum calculator in special presentation case

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Dating to the late 1930's, this is the Fowler Magnum Long Scale calculator designed mainly for engineers, and consists of a series of concentric circular scales. It was the largest of the Fowlers range before the Jubilee Magnum came along in 1948. In very good condition, with clean scales & a chip free glass face, it comes in a special blue velvet lined presentation case, and is in full working order. It has a chrome backplate which is free of any dents or blemishes, and measures 120mm in diameter.

Price Status Code UK P&P Overseas
  SOLD SC1154    
Complete Otis King model K cylindrical slide rule with box & instructions.

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A fine example of a vintage Otis King cylindrical slide rule calculator complete with its box, instructions and original leather case. This is a type C, model 'K' serial no W8549, with very clean & legible helical scales enabling numerous mathematical calculations, all detailed in the original instructions which are also included. The patent no is 183723, with scale 414 on the bottom, & 423 on the top.
Made by Carbic Limited London during the 1960's, it really is in very good cosmetic condition with the only blemish being some light verdigris spotting on the black metal casing, and is in good working order.

Price Status Code UK P&P Overseas
  SOLD SC1556    

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This is a rare Calculigraphe circular slide rule by Henri Chatelain which dates to the latter part of the 19th or early 20th century. The design is based on the Boucher calculator introduced in 1876, and was made in Paris. It's a double sided calculating circle with one moveable dial and the other fixed, and performs numerous mathematical calculations including cube and square roots
In good working order, with clean scales, in a chrome pocket watch style case which is also in excellent condition.
Measures 53mm in diameter.

Price Status Code UK P&P Overseas
  SOLD SC1258    
Muldivo Pinwheel calculator

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Nice condition Muldivo Pinwheel calculator incorporating 12 digit setting register, 18 digit results register, and 10 digit revolution register, serial no DER 160648. Similar to the Mentor in that it's fitted with a back transfer mechanism, This transfers the number in the result register, centre right, to the setting register, centre, which can be very useful in chain calculations. Probably made by Thales in Germany this calulator is in full working order with original plastic dust cover, and dating from the late 1950's. Overall dimensions, 11" x 6", weight around 6kgs, overseas buyers please email for shipping costs.

Price Status Code UK P&P Overseas
  SOLD SC548    
Fowlers Magnum Textile calculator

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Fowlers Magnum Textile circular calculator, measures 12cm diameter, in very good condition and in leather case which is also in fine order. Also comes with its original 42 page instruction book which although a little dog-eared is complete and perfectly useable. Dating to around 1950, its becoming increasingly more difficult to find these items in such good and complete condition.

Price Status Code UK P&P Overseas
  SOLD SC276    
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