Aristo 816 piccolo mini pocket slide rule sleeve 1970 Germany

Very small pocket slide rule by Aristo from Germany. This is the model 816 Piccolo, one of the smaller models. This slide rule in very good condition with only small signs of use (some fading to the yellow lines), It comes in the original Aristo signed leather sleeve in great condition. The rule measures only 12 cm or 5 inches. See the attached video on how to work your vintage man tool : slide rule operation instructions!