most notably, it doesn't have the patent #, the nameplate is actually on the opposite side and is a riveted plate instead of etched, the NSN number is described as "mount assembly, helmet", hard to see but it has a much longer flappy paddle for adjusting distance from your eye, the center body is painted instead of anodized, and of course the big twisty knobby for adjusting the vertical height
All the fake rhino mount I could look up seem to all have the NSN# 5855-01-457-2953 and no patent # (which is what worried me)
Any guesses as to where I got it? Because I absolutely DEFY you to find a rhino clone that has a vertical adjustment, I never did and I looked for a long time lol