I have a few of these and have personally not seen any fakes in the market yet. This looks authentic to me. The movement would be uneconomical to try to copy accurately, so you could ask for a video of the watch running through the menu options. However, the photos show the different modes pretty well and that is all accurate. So I think the watch is fine.
In general the photos on the listing are not that good - I wouldn't be comfortable buying this without better photos so I can really see the condition of the bezel and glass. I'm pretty sure this is a "back to Omega" for a service, I may be wrong though so you could check with the well known Omega service guys mentioned on this forum. But, if the glass has a scratch that is annoying the service may be pricey.
It does not have the Kevlar strap that these can come with though, just a third-party rubber strap. One of the great things for me with both the 1st Gen and 2nd Gen is the titanium bracelet - it's super light weight and very comfortable. The Kevlar strap is okay - it's personal preference - but having one or the other that was original to the watch would be better when the times comes to pass it on.
Having said all that, you can buy both straps so at the price it is now on ebay, it looks a great buy and you'd have some cash for a service.
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