the stickers look like they are curling slightly along the edges in some places so it could possibly be an original minus the head since you can basicly pop the head off the pegs on the rear window cover... i would guess that if he bought it off some one prior to him owning it they might have lost the orginal head and put a wheeljack head on in it's place.
Well, all the genuine Marlboor Wheeljack pictures I've seen have a blue-tinted windscreen, the red parts don't look hand-painted and the roof is entirely red. This is just a painted Wheeljack