“Buying a vintage watch – particularly a Rolex – is always a little jittery.  Buying one from someone you don’t know is doubly so.  I needn’t have worried.  I “met” Giles on Twitter and in fairly short order had agreed to part exchange a rather cherished member of my collection for his ’66 5513 Sub.  In fact, Giles’ own watch.  I really needn’t have worried.  I was out at meetings the day the watch arrived, but Giles sent a series of ever more concerned texts (in response to meeting-induced radio silence) to find out if my new watch had arrived.  It had.  it was better than he’d described it and I’m still delighted with it.
Mark