Quote:
Originally Posted by Yakman
Probably what's the most curious thing to me about this pistol is the Proof House style and placement of the commercial firing proofs. And then the toggle, the usual place would be on the left side. On this Luger, if it is even a firing proof at all, is on the top of the front link, to the left of the extractor. I'm only guessing that is a proof. It looks to me like a crown over the two upright sides of an "N", absent the center slant of the "N". Jack
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If, during the rework, the breech block - a major functioning part - was replaced, then a proof mark was likely required just as it would be on the new barrel. I'm fairly certain that the proof mark is a C/N.
None of the OP's pictures show the breech block serial number but I suspect that it's been replaced. Even if not, it's still reasonably logical that the breech block would be proof marked. Reworks after WW1 are a wonderland of unusual variations and markings.