This slide rule is very good condition and comes with the original sleeve, both made in Germany by Nestler. This model is the elaborate polymath-Duplex, nr. 0291. with 22 scales on both sides. The Nestler name and model is on the rule itself and on the sleeve (just Nestler). It is made of plastic but has metal reinforcements on the ends as well as on the heavy duty cursor with multiple hairlines. Curser, slide rule and sleeve are complete and in very good condition with only small signs of use and age. The small rubber feet are accounted for with some signs of age. It measures ca. 35 cm or 14 inches. Check the attached video on how to work your vintage man tool : slide rule operation instructions!