This large circular slide rule comes in the original sleeve and with it’s manual in English and Swedish. This model is called the system Wern ABC and it was made by IWA from Germany with designation 1638/ It is large, measuring ca. 21 x 21 cm or 8 1/4 x 8 1/4 inches. It has a single cursor and many, many scales, solving the decimal point location as well. Made in Germany in the 1960’s and everything is in great condition, the slide rule is fully functioning with all parts intact. The sleeve measures 22 x 22 cm or 9 x 9 inches. Check the attached video on how to work your vintage man tool : slide rule operation instructions!
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IWA 1638 sys Wern ABC circular slide rule full set 1960 Germany
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IWA 1638 system Wern ABC circular slide rule full set, made ca. 1960 in Germany
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