Nestler 37 Electro mahogany slide rule in case 1940 Germany

This is a beautiful mahogany earlier slide rule that was made by the German company Nestler. This is the model 37 Electro in an early execution. It has a folded cursor that gives acces to extra scales on the thin side. It comes in the original cardboard signed holder  as well. It measures. 29,5 cm or 11 3/4 inches long. The slide rule and the slider are all complete and in good condition with only signs of normal use and age. Information on the back is complete and perfectly readable. The owners initials are on the back. Check the attached video on how to work your vintage man tool : slide rule operation instructions!