Smaller pocket slide rule by Aristo from Germany. This is the model 810 Puck and comes with: mini slide rule in great condition it’s original Aristo signed leather pouch with metal clip in great condition a manual in German in great condition original cardboard outer box in very good condition original paper control slip The box measures ca. 17 cm or 6 3/4 inches long, the rule itself only 12 cm or 4 inches long. See the attached video on how to work your vintage man tool : slide rule operation instructions!
