2x Alro 100 R + 200R circular slide rules full set 1940 Holland

This is a set of 2 Alro round slider rules from the 1940’s. One is model the model Syst 200R, the other the model system 100R. Made in Holland in The Hague somewhere in the 1940’s. The model 200R has the thicker case used in the seconde world war, the other if from just before the war and has the earlier booklet. Both are complete sets with outer box, service manuals, manual and even the plastic wrapper. The condition as hardly used but the rules have some signs of aging and storage. They are in good working condition where the 200R has the upgraded cursor added after the war. Closed they measures ca 13,5 cm or 5 3/8 inches wide. See pictures for details.

Check the video on how to work your vintage man tool : slide rule operation instructions!