To be honest, most of my watches have been bought and sold through eBay, mainly because there are few other options, other than paying over the top in a high street retailer. However, one needs to be so careful. I just bought a new watch, well new to me, and was trying to make up my mind between a Rotary Les Originals Chrono, and a Tissot Quickster. Both are excellent watches with quartz ETA movements and sapphire windows. I was close to completing a deal with the Tissot seller when he told me the watch would cost an additional £20 if I wanted the box. Of course, this set the alarm bells ringing. I messaged him and asked if the watch was genuine, and he replied that it was indeed 100% kosher. I replied "every Tissot watch that leaves the factory leaves with a box, so if you don't supply the box what will happen to it". I received no answer. Needless to say the watch is a fake. Only last year I decided to purchase a Tissot PRC 200, and buying a genuine one at a good price is incredibly difficult. Despite informing eBay of these sellers they do nothing. Unlike many watch enthusiasts, I don't actually have to much of a problem with fake watches, as long as the buyer in question knows it is a fake, but appreciate I am the minority voice on this subject. The problem with these sellers is that they price the watches close enough to make people think they are a bargain, and they lie about them when asked.
Anyway, I have managed to secure a used Rotary Les Originals at what I believe is a very good price, but am awaiting it's delivery. Watch this space