VERY unlikely a DRGM marked gun being post-WW2. DRGM = Deutsches Reichs-Gebrauchsmuster = registered and protected design expired after only 3 years, rarely renewed for another 3. From 1951 to 1974 the Suhl, GDR proofhouse again used marks very similar to the old, pre-1940 ones. This leads to lots of erroneous datings.