I think the mileage could possibly be legit, mainly because the dash and gauge cluster look like new, plus check out that Whitco top, that's one of the nicest ones I've seen! I think the mat was pulled and the floors and kicks were painted (clutch rod and rubber boot painted body color, drift all over the T shifter cover). Also, the body was painted at some point. Ford didn't paint the grill and headlight rings body color, they would have been Wimbledon White. Plus all the stainless screws in the inserts are painted body color. I agree the seats have been redone. Not to mention the windshield latch and hold down have both been painted. Never the less it's probably the nicest '68 U13 around.
I think I might buy a Marti for the hell of it, mainly to see if there is any mention of the mirrors. The '68's had either had the 66-67 style mirror or the 68 specific mirror. I have never seen one with OEM door mirrors mounted like that. It would be interesting to see what is filled in on the inside of the fenders.