This large circular slide rule comes in the original sleeve and with it’s manual inSwedish. This model is called the system Wern and it was made by IWA from Germany with designation 1633 (there is also an IWA 1638 system Wren). 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 and has a short hand for the different scales on the back. Check the attached video on how to work your vintage man tool : slide rule operation instructions!
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IWA 1633 system Wern circular slide rule full set 1960 Sweden Germany
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IWA 1633 system Wern circular slide rule full set, made ca. 1960 in Germany / Sweden
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