That's a real hard question, but the answer is, "It is an early AAH grade Pigeon Gun. The reason it is marked A rather than AA is that the first few AA guns were manufactured before they established this grade as a catalog item. However, the "7" is a sure indication that it is a AA, not an A. What is the rib marking? It should be Whitworth Fluid Steel or Damascus. I have not searched for the gun in the Serialization Book or the AA list in the Parker Pages. It may or may not be listed in either or both of these references.
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