Mike,
The proof in use by the proof house responsible for commercial proofing of DWM pistols was the crown/B, c/U, c/B proof set. The crown/N commercial proof was instituted in 1910, and in use by 1911.
The US has no national proof laws. GERMANY marked 1906 Lugers exported to the US before 1911 were sometimes c/BUG proofed and sometimes not, in apparently random application. After 1911 all the 1906 Lugers for which I have the report were c/N proofed.
If you could supply the serial number for this gun it should be possible to say whether it was in the c/BUG or c/N range, and thus whether or not the absence of a proof is appropriate.
--Dwight
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