| Name and Model Number | Post Versalog With @SUN@ HEMMI JAPAN 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 |
| 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. |