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 (Dutch) and extra answer sheet. It also includes a piece of paper pointing out the details between the 2/82 manual and the new 2/82N features! Both slide rule and slider are in very good condition with small signs of age (some yellowing), the box is also 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!