The watch looks ok, but without a good, clear pic of the movement, it is impossible to be sure. Also, the seller has little history (& all private sales, which might mean there is something funny going on) & what he does have appears to be mostly non-Rolex watch parts like bracelet links & non-watch-related, so I would either have the watch checked out at a Rolex dealer before you pay or pay with a credit card (so you can cancel the charge if something does not check out) & take the watch right over to a Rolex dealer as soon as you pick it up.
Good luck.