Originally Posted by Alpo
Both the crown over what looks like a IV, but what I think is a W, and the eagle next to it, look like East German proofs. That would make it post-war.
Alpo, Dieringhausen is in the North Rhine area east of Cologne and would not have been in East Germany.
(Note abbreviation RHLD for Rhineland after Dieringhausen on the rib)