Barr, Mauser, during the Nazi era, used E/N proofs for their commercial models. It appeared usually on the left front of the receiver and on the front sight block, at least. The commercial dated 1906 style models prodeced by Mauser are quite scarce and pricey. The only ones I have ever seen were dated in the early pre-war 1930's. Even though Kenyon states they were dated up through 1942, I have never seen one. How about anyof the other folks out there?
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