I believe there are many decent guys in the industry, who are resellers, who entered in the early 2000s. They, like the rest of us, take our knowledge from a very, very small group of people - 'the experts'. With Rolex not willing to get involved in any verification whatsoever, it is all about trust. And even though I might trust a seller, that seller has also trusted their initial source, who may or may not have trusted someone higher up the food chain, etc etc. And I don't know that person, so my trust stops there. I would never be able to shake the doubt.
I am really annoyed at this all, because I cannot re-iterate how beautiful I find vintage Submariners and Sea-dwellers. You really feel you are wearing a piece of history, a style of watch that would never be made today, yet shares so much DNA with its modern counterparts.