Hi all, my watch repair guy has a genuine NOS bezel in his stash that would finish off my watch nicely. He has asked me to make an offer for it. Obviously these very rarely come up for sale so I have nothing to compare it against. What would be a fair price in GBP to offer? He is very fair to me with his service costs and parts supply, and I don't want to insult him, but I'm also keen to secure a good deal. Thanks for your help.