Maybe you could just compare it with the official photos on the Omega site, or here, or any of the major watch sites.
It's extremely hard to authenticate this way, even with the movement pictures since I have seen fake movements in my experience. Looks good but no one here has the capacity to authenticate...
Rough pictures. Difficult to tell. Tho I'll admits in skeptical based on the bezel. More pictures and, as previously mentioned, an unobstructed shot of the movement should tell all.
Hard to tell, but my gut said something not quite right with bezel also. Proportions look slightly out on one of the pics, a bit too wide perhaps.