Original Kurvenmesser German Map Reader

Decent, used condition German map reader. This one has various map scales front and back. Simply trace a path along a map and the dial will show you the distance traveled. The wheel is a little sticky, but it is working. Great map case accessory. The construction and look of the map reader is more war time/pre war compared to post war ones I am familiar with, but that doesn't rule out early post war manufacture. General wear on the face.