If it weren't for this forum I would have a hard time determining gen vs. rep. The are some "experts" on a gen PAM forum that I read who, in the "real or fake" section authenticate watches for other members when those watches have rounded corners in the CG, a straight incabloc (as opposed to the Y shaped one), wrong dial fonts, etc.
Now I've made RWI my home even I feel like I know a thing or two. Members here find defects in gens that made it through GC at the factory