Just picked up the Birmingham side lock pictured below and am confused by the markings. Looks to me like it was proofed first in London with 2 1/2 inch chambers and later in Birmingham at 2 3/4 inches- is that correct? Any way of dating the manufacture of this gun or the date of proof? Was Rowland Watson the maker or the retailer who sold the gun? What is known about the Boulder, Colorado company- was that the importer?
Anything you can tell me about this shotgun will be appreciated and I am looking forward to learning about these beautiful guns. Thanks, Jim
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