I by no means am an authority on 70's fenders, but I do own a '76 P and a '76 J, and I'll offer a few observations.
1. wassup w/ those knobs?
2. though the holes for bridge cover screws are present, the absence of ones for a tug bar/thumbrest are suspect, unless it has a replacement pickguard.
3. the case is also questionable since he calls it "original".
molded plastic cases were a product of the 80's, weren't they? the stickers seem pretty 80's to me as well.
that thing obviously has replacement parts, and even if everything was original, wouldn't it be worth about 1/2 of what he's asking?
I defer to the experts, but I'd say the guy is fishin for a sucker.