| 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 |
| Thumbnail (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. |