yeah without checking, Rolex is all i really know about to be honest. more out of fun than anything else. The easiest way to tell a fake GMT watch is that there is a very common and cheap Chinese mechanism that most fakes use. Said mechanism does not have the correct internals to allow the GMT hand to sit over the top of the hour hand. so it should be (from the face of the watch towards the glass/crystal: hour, GMT, minute, second.
Some of the better fakes actually change this mechanism which is time consuming and expensive, if that's the case then normally the way to spot a fake rolex is:
- the rehaut (the Rolex engraving on the inside of the bezel). I must say that yours is probably one of the better ones I have seen.
- the bezel lettering/spacing
- alignment of the numbering, minute markers, rehaut, rolex crowns
- needles, the hour hand should have a small white infill (which yours does), normally fakes is much bigger
- main crown, the 'hole' on fakes is normally much bigger than the real watch
and so on....
if all else fails, as soon as you try and change the time or date, the mechanism won't function as it should
its quite interesting when you start looking in to. Also there is a 'cult' of people who seem to get kicks out of buying 'fake replicas' and then modifying them to as close as the original as possible.. with correct boxes/paperwork etc I must add!