Originally Posted By: eightbore
One poster stated something to the effect "If it is proofed at .729 and it is still .729 with XXX barrel walls, it is original." I disagree. A thin wall gun, in proof, may have been struck many times to get as thin as it is. Dig would know much more than I about this situation, but, in my opinion, many thin wall guns in British auctions got that way from the outside.
It was I who said it and generally, guns are not restruck externally. I disagree with your premise.