16750 sanity check

[amillionyears]

So I got it in my head that I really wanted a Submariner and I did a ton of research on them. I know it's kind of a dumb thing but I fixated on a birth year watch and Subs from my birth year are really boring, while it seems that the GMTs from the same year are the ones to get. The more I dug the more I realized I actually wanted a GMT, and after a while I came upon the one pictured in the link below. Anybody see any issues or red flags? Anybody dealt with Hill Street Watches before? It seems they're the retail arm of ABC Watchwerks, which gives me some confidence, but I could always use more. Thanks in advance.

http://i.ebayimg.com/t/VINTAGE-ROLEX-GMT-MASTER-16750-STAINLESS-STEEL-CIRCA-1981-AMAZING-WATCH-/00/s/MTYwMFgxMzEy/z/c-QAAMXQATlRZLys/$T2eC16NHJHoE9n3Kd2q0BRZLyrz0,!~~60_57.JPG