Full Details


Name and Model Number Otis King Calculator
Model N
Carbic Ltd.
Country of Origin England, London
Date of Manufacture 1923
Front Scales Scale No. 424: Sterling Currency - 1/4d. to 1,000
Back Scales Scale No. 422: Numbers, vulgar fractions. French & English Weights & Measures - 1/4 to 2,500
Scale Length 168 cm
Type of Rule Cylinder
Construction Nickel plated brass with paper scales. Scales printed in spiral fashion around the upper cylinder and lower handle.
Area of Use Generic
Comment For currency calculations.
Rarity RR
Donor Collection of Dr. Paul J. Tarantolo Jr.
Match Number 217
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In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen
(1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD.
• RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace.
• RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale.
• RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale.