If I see something that's mismarked, I'll usually point it out to them. Of course they don't have the enormous collective wisdom of this BB when it comes to doubles!
What's your take on the price on that pair? I thought it probably wasn't too bad, but I also read your earlier comments about guns from different eras and importers, and I can't hazard a guess as to date of production on those guns. I saw they were marked 70MM, but I also saw the "non pour la balle" stamp. I've never been able to tie the latter to any specific time period on French guns. I don't think it's mentioned in anything I have on French proofmarks. Were it British, that would indicate a pretty old gun--but I'm guessing those are not that old.
