The inca bloc is so easy to see once you know it. Even a newbie like myself can tell. I have yet to see a rep that has this copied properly. So to the OP's original question, one can say with a 100% certainty that it is a rep with or w/o a gen to compare it side by side. It seems like this would be an easy fix, not sure why it has not been addressed. Kinda like the lettering on the front. I don't know why they don't fix the "A". It would be simple and likely just an oversight that has never been corrected.
The other easy tell on this watch is the fact that the rep is a low beat movement (assuming the gen is only made as a highbeat, experts can chime in). You can see on the gold gear in the center that has fewer teeth. Of course they have highbeat rep movements which eliminates this tell.