I've compared the pics closely with my UPO pumpkin on black strap with orange stitching. I believe it may be a gen due to the bezel. The bezel insert is more recessed on the Bay watch, and the coin edge bezel is flatter on the ends of the points. Of course it could have been modded - These might be easy mods to do.
Otherwise, I can find almost nothing even remotely different between those pics and the UPO I bought from the D4M group buy - right down to the misalignment of the numbers on the bezel (if you look closely at the pics and at your UPO, you'll notice all the numbers on the bezel are just slightly tilted inward. In other words, on the number "20", the "2" leans toward the "0", and the "0" leans slightly toward the "2". The same with 30, 40, and 50.). So if that's a gen, this has got to be one of the very best reps ever made - which makes me think it's probably a UPO with slight bezel mods.