Full Details

Name and Model Number OAO Kalibr - Moscow
Country of Origin Russia, Moscow
Date of Manufacture 1967
Front Scales K A C (D CI)
Back Scales T ST S (C L)
Scale Length Diameter 73mm (2.8 inch)
Type of Rule Watch Type
Construction Brass metal with two working sides with large and small rotating metal dials and transparent rotating disk with a line - cursor.
Area of Use Generic
Comment Multiplication, division, extraction of a square root, finding of trigonometrical functions of a sine and tangent, calculation of the area of a circle.This slide rule was made by the "Kalibr" (calibre) plant in Moscow It came in a 100 year Russian Anniversary Box (1917-1967)
Rarity RR-RRR
Donor Collection of Richard Davis
Match Number 400
(Click Picture for Details)

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.