Looking for info on a HBC 20GA SxS. Here's what I know:Stamped on side plates Hudsons Bay Company "Made in England. Stamped on barrels "Imperial No.3, 2.5 inch chambers ,30 inch barrels proofed for 7/8 loads. Dolls head rib extension.the condition is very good -- retains most of its blue --wood is also in nice condition -shows little ware.
I don't know much about proof marks but I think made around 1925?
I'll attempt to add a picture of the proofs. I inherited it and may not want to keep. Any info on this and value would be appreciated.