Vintage DIETZGEN SLIDE RULE in Orig Hard Leather Case! - eBay (item 310015189636 end time Jan-22-08 18:23:47 PST)
This vintage slide rule is marked, "Dietzgen 1737 Japan" and "Decimal Trig Type Log Log." The hard leather case is embossed, "Dietzgen" on the flap. The slide slides easily, has no wear at all and fits snugly in the case.
A slide rule was the pocket 'computer' before silicon chips changed the world. Now it seems as old as an abacus, doesn't it?
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