This is a very specialist slide rule made by Aristo from Germany. It is a Kaufmann slide rule (trader) before that name was being used and currency conversion was added. It is an early version from 1943 known under its early name: Praktiker and has the number 945. This model was used for quick percentage calculations and simple divisions and multiplication of amounts and prices. It comes in the original signed cardboard container. Everything is complete and in very good condition with only small signs from normal use and age. It measures 30 cm or 10 inches. See the below YouTube video I found on slide rule operation!
Aristo 945 System Praktiker slide rule container 1943 Germany
€45.00
Aristo 945 System Praktiker slide rule with original container, made in 1943 in Germany
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