An interesting model slide rule by Sun Hemmi from Japan for the Dutch Ahrend Group (Office Equipment). It has the 280 nummer from Sun Hemmi. It has a double sided slider to give a total of 13 scales. It comes in the original Hemmi & Ahrend signed plastic container. Both in great condition with hardly any signs of use and age. It measures ca. 33 cm or ca. 13 inches. Check the attached video on how to work your vintage man tool : slide rule operation instructions!