I agree with your No's 1 & 2 and I'll add that (almost always) the lockplates on the Grade-2 or G hammer guns as well as the fences of the hammerless Grade 2 (GH) were engraved with gamebirds, the GH with two birds per side whils the next grade up, the Grade 3 or D & DH guns had a bird dog on either side.
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