Full Details

Name and Model Number Post Versalog
On Face of Top Stator
Country of Origin Made in Japan by Hemmi for Frederick Post Company of Chicago
Date of Manufacture November 1963
Front Scales LLO, LL/O, K, DF [ CF, CIF, CI, C ] D, R1, R2, L
Back Scales LL/1, LL/2, LL/3 [ T, ST, S, C ] D, LL3, LL2, LL1
Scale Length 25 cm
Type of Rule Slide Rule
Construction Celluloid on bamboo
Area of Use Generic
Comment Donor knows of only one other example of this rule with Hemmi markings on the top stator.
Most of Hemmi's 25 cm duplex slide rules bear this marking on the top stator, but Post's 25 cm duplex rules do not.
Rarity RRR
Donor Collection of Ted Hume
Match Number 250
(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.