I have gotten watches through ebay, but up to a certain limit....It is possible that a reputable seller would sell their watches.
Especially now. Times are tough. I have sold a few and I don't buy fakes, but then I am not a dealer. Try Bloomingdales,
Nordstroms Tourneau has a web site, also. I saw that watch in all gold and it is stunning. It's about a 36mm.
At a certain level, I gamble, and I love watches. In general, I believe that if something is going be your main piece, go the AD route. Full warranty, etc. If you go outside of that, you will pay if you have problems. Of course, once a watch is out of warranty, you pay anyway.