My first thought was “converted Rook Rifle” but the.410 Cartridge marking on the lower tang looks to be applied when it was first made.

Are there any proof marks under the barrel in front of the forend lug?

P.S. Sorry , just read your second post.

I think made as a 2” .410 but British Proof marks at that time did not give much detail.

Last edited by Parabola; 11/15/24 01:18 PM.