Interesting Pocket slide rule by the German company Nestler. This is the model Electro with number 0137 from the 1970’s. It comes as a complete set in the original leather signed sleeve with box, control slip and manual in German. It measures ca. 15 cm or 6 inches long. The slide rule and the slider are made of plastic and everything is complete. Everything is in very good condition with only small signs of use and age. Check the attached video on how to work your vintage man tool : slide rule operation instructions!