I have just acquired a beautiful M6 (see below) from Andy at Classic Cameras in London. He described it as “mint” and it doesn’t look as though it has ever been used. Despite its age it is unmarked and was serviced by Leica Germany prior to sale. First time I have dealt with Andy who was very helpful, very knowledgeable, and a great guy to talk to. I have known of his shop for years and he has supplied Leicas to all the greats. I would recommend contacting him, a sheer pleasure to deal with (everything done by phone in my case) if there is anything you are looking for.
Gerry