Definitely not Belgium and not Spanish. I'm 99% sure it's British. Birmingham proof house.Belgian or Spanish commercial double breech block from the 1920s-1930s. I had one that was identical, and it had "Belknap Hardware Co" scroll engraved into the barrel rib.
They were soft and cheap, but sometimes quite pretty.
I believe the "proof marks" stamps are Belgian.
Haha. You should try the Reddit approach: "What is this shotgun part? Go!"Okay! Thanks for your help and ideas. This is what I like about CGN. People willing to share their knowledge. No snide remarks.![]()



























