Large less known brother to the 2/83N slide rule that was made in Germany by A.W. Faber & Castell and is called the Castell Duplex 2/82N. This is a complete set with box, manual (Swedish) and extra answer sheet. Also has a small paper instruction sheet. Both slide rule and slider are in good condition with some signs of age (some yellowing), the box has a small piece missing but otherwise complete and working. It measures ca. 38 cm or 15 inches long. The slide rule and the inner piece are made of plastic. The rule is reinforced with metal pieces on the ends. Check the attached video on how to work your vintage man tool : slide rule operation instructions!