Adam jackson

I happen to have exactly the same gun in similar condition, my father bought it back in the early 80s from a gun shop in Doncaster. I always get asked if I’m interested in selling the gun when ever I do take it out shooting but I will never sell it due to it being my fathers gun and besides I enjoy it myself.The big question for me is what’s it worth?? No one knows how to value the gun simply because they’ve never seen one before, have you ever had yours valued? t