What a lot of marks! Serial number puts it at 1892. I can see the original marks. Then it looks if it was nitro proofed at some unknown time post 1954 as a 3" chamber 12 bore, then re-bored out to 10 bore and re-proofed again in 1961. The 12C in the diamond shows it was a 12 bore in the chamber dimensions originally so unlikely to have been a chamberless. Unusual for a gun of that period to be fitted with 26" barrels so may have been shortened at some time. Of course boring out to 11 bore will have meant that some choke could be included. I'm sure this gun could tell some tales and has some secrets to give up. Lagopus.....
