They almost all 7750 anyway arnt they? I have seen some hublot that are 2894-2 also.
The 7750 ones are easy to spot due to sub dial layout. We had a limited edition Morgan one in the other day that replaced one of the subdials with the Morgan logo, while leaving all the parts for that subdial in the movement.
Hublot don't impress me movement wise for the money.
But hey beat frank Muller for ripping off ETAs by just milling out the logo and calibre number, then adding a platinum rotor for no reason other than wearing out the rotor ball race quicker than normal.