I've seen a few instances of guns rebarreled by someone other than the maker recently. I believe there are one or two currently on the Champlin Arms website. In any case, if it's a Damascus gun with replacement steel barrels, if done any time in the last 60 years or so, the proofmarks will show them to be replacement no matter the name on the rib. If they're properly done and by a well-known maker, and if we're talking a gun other than a "best", I don't know that it would bother me all that much.
