Rare old german coffee grinder by Dienes, complete usuable, made in the beginning of the 1950s

Rare old german coffee grinder by dienes, made of wood and metal, with a steel grinder inside, marked on the bottom with d.r.p. (deutsches reich patent) 1710, complete usuable, in excellent vintage condition with minimal traces of age and use. Width nearly 13 cm - depth with handle and crank nearly 20 cm - height with handle nearly 22 cm. Weight 1, 51 kg !!.