Looks genuine from here, if it's a fake its a good one. Only thing I'm not 100% convinced on is the second hand, but it looks good compared to this:
http://www.goldsmiths.co.uk/TAG-Heu...pid=17380731&gclid=CKuCztib9cQCFQLMtAodVlsAww
A clue may be the glass, has it picked up any scratches in the last 4 years? Genuine sapphire crystal on an aquaracer is near indestructible, I've not marked mine in 6 years of hard wear.
Im saying genuine with moisture damage.
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