Two Nestler school slide rule that come with the original signed container and one half container, all made in Germany by Nestler. There are 2 different model slide rules the Beta 0252 and Delta 0254 both from 1967. These models also share the same manual that is included in Dutch. The manual also cover the mode Gamma 0253 which is not included. The Nestler name and model is on the rules, manual and the Nestler name is also on the single container top. Both made of plastic and with a simple plastic cursor and of similar build, yet different scales. Cursers, slide rules and containers are in good condition with small signs of use and age. They measures ca. 32 cm or 13 inches. Check the attached video on how to work your vintage man tool : slide rule operation instructions!