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the first thing that should pop into your head is that it's probably a refinished dial

Partial serial number is 3690XX or 498XX, one of those is off the bracelet, can't remember which
Movement cal 1530 - 25 jewel automatic
fake Rolex's were very common in the 80's and 90's...they were a dime a dozen
Right, he does have an appraisal letter from a jeweller who opened it (though not a Rolex AD), so I suspect the movement is real... but I'm leaning towards a redial to purport as another watch at this point.
I'll photograph the crap out of it tomorrow and see what we can figure out.
An appraisal letter is a worthless piece of paper.