What's a "Hang 10" ?

its a thick plastic taillens cover that goes from one end of the taillite lens to the other,seems to protect the taillites, it came out of an original 1973 340 duster with folding rear seat.like I said ive only seen 1 at a car show ,and thow its for the folddown seat cars.If its worth a decent amount Ill auction it off for marvins cause as I dont have the folddown seat in my car but I do know its a rare piece.has a 1 inch crack from sitting but once installed crack will shrink back any would hardly be noticeable.