This round slider rule is marked ALRO and it comes in it’s complete metal case. Made in Holland in The Hague around 1950after the patents were received. It has a simple circular cursor with 3 hairlines. The case is lightweight so probably after WW2 but not far behind. It is in good working condition with some signs of use and age but nice and white rule and insert in the top. Fully functioning. Closed it measures ca 13,5 cm or 5 3/8 inches wide. See pictures for details. Check the attached video on how to work your vintage man tool : slide rule operation instructions!
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Alro Concrete circular slide rule metal case 1950 Holland
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Alro Concrete circular slide rule metal case made ca. 1950 in Holland
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