From what I can see, at least major parts of this watch are not from 1985. As others have already mentioned, the bezel and end links are not from 1985. Also, the case shows a serial number. There was no serial number engraved on the case in 1985. That was not done until the early 1990's.
All in all, I would not pay the asked price for this watch, especially if getting a 1985 watch is important to you!