dont buy, in my opinion without a doubt a scam. There is no way someone could pofit from selling at that price unless they where stolen, if so there is still no incentive because they could still sell for much higher with less suspicion.
More so a tell in fact is that there are no photos of the clear caseback (the real place to distinguish a hublot gen from fake)
I can see however that on the SS HBB that they hublot font looks too bold on the rotor ( the very obscure angle of the picture is should also raise an eyebrow).
If you want to buy a gen hublot, definitely buy from an AD, although Hublot is notorious for not giving discount on their watches. The hublot reps are so good these days that someone could easily make a few small mods to make it pass off to any unsuspecting buyer, and i dare say even some AD's.
If you want to buy a rep HBB then i recommened either Hont or T4D, both of which can be found in the dealers section.
The piece i am recieving from T4D should be near perfect and only need one mod (the engraving of the H and the Hublot on the rotor), the micro regulator is there (although i am pretty sure not functional) and it has the correct rotor bearing.
You can find information about Hublot fakes on their website under 'collection', then you will see what i mean by the rotor bearing, micro regulator and engraving..