Yeah, I have a gen 2254.50 SMP and the AR is only on the inside of the crystal and not noticable, although certainly does the job in terms of cutting away glare.
(This makes it an ideal tool watch as you don't have to worry about scratching or smudging the outer AR off)
Anyway, if you are after a rep SMP, I wouldn't bother with the current ones. As I said before, your best bet is to keep an eye out on the sales forum for an old-factory SMP with the correct He valve placement, better crown guards, etc. Not 100% sure on the AR situation with the reps, but I believe that the old reps have the AR on the inside of the crystal (like the gen).