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Old 07-19-2019, 11:28 PM   #4
Mike S
Mike S is offline
Join Date: Feb 2003
Location: USA
Posts: 243

The BUG proofs are Commercial proofs stipulated by the proof law of 1891. Crown/B stands for Beschuss to be applied to the finished firearm, crown/U means it has been inspected before and after proof firing, and crown/G was the mark applied to rifled barrels. Reference is “The Borchardt and Luger Automatic Pistols”. Hope this helps.

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