This small pocket slider rule is circular on a square base, marked with the model number Aristo 602. It comes in it’s original leather sleeve and with the complete dedicated 602 manual in German (marked 1953). Made for easy and simple calculating using 2 scales only. In good condition, fully functioning and complete, with some signs of use or age. Original leather pouch is unmarked. Diameter of the disk is ca. 12,5 cm or 5 inches. Check the below video on how to work your vintage man tool : slide rule operation instructions!
