First of all, single AR is very subtle. For the most part, you don't even know it's there because you still have all the usual reflections off the exterior crystal surface. I coated my 196 with single sided AR. It does reduce reflections off the dial and make the dial look a *little* crisper. And you do see some blue/purple highlights under some lighting - but not too often. So, if I were the judge, I'd say that no AR is closer to genuine for PAMs than double AR. On the otherhand if I owned a gen PAM I'd strongly consider recoating its crystal with double AR, unless of course it was a rare vintage model or something. But, reps aren't the only watches modded... If you ever browse Paneristi you'll see people who do all sorts of things to their genuine PAMs. I saw a gen 177H that was bead blasted and it looked really nice. So, putting double AR on a PAM is relatively benign IMO. On the otherhand, on other forums, you'll see people discussing how to remove the outer AR coating from their gen watches because they don't like it. So, really, I'd say it's up to you. I happen to like double AR a lot, even on a PAM.