Best place to buy a used Rolex?

[Rock]

I have noticed that most cities have a few 'Watchmaker' shops - usually owned and operated by an experienced and reputable watchmaker who often has a small selection of second-hand quality watches on offer. These are usually hidden down small arcades in the inner city where only the initiated know of them. Obviously one needs to do some investigation of these before rushing into anything. My approach would be to identify them through other Rolex enthusiasts and then to get to know the owner a bit by calling in and initiating conversation on appropriate topics. I can think of one particular one in my State Capital where there is often a watch enthusiast chatting to the owner at the counter.