A concept car with a folding exposed rear seat was introduced by AMC at the 1966 Society of Automotive Engineers convention in Detroit.[98] This was the first "AMX" (American Motors Experimental) named car. The sports car design features a rumble seat for two additional passengers that was described as a "Ramble Seat" in homage to the automaker's predecessor Rambler models. This back seat folds into the trunk space and the rear window flips down, but these are not fully weatherproofed designs.