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Old January 23, 2012, 03:05 PM   #7
James K
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Join Date: March 17, 1999
Posts: 19,345
The Crown/B indicates the gun was proved in the finished condition. The Crown/U is the final definitive proof. The Crown/G is the proof for rifled barrels. Collectors sometimes call the combination the "bug marks".

Basically, the three marks were replaced by the single Crown/N in 1912, which was replaced by the Nazi Eagle/N in 1939 and by the Federal Eagle/N after WWII.

Jim
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