Aluminum body

I was just watching some old re-runs of "Dallas Car Sharks." A car that was sold at one of their auctions was a 1938 Plymouth Coupe. The buyer claimed that it was an aluminum body car. An all aluminum body Plymouth in 1938??? I researched the 38 Coupe, and found nothing to back up the claim of an all aluminum 38 Coupe. What say the experts?
Norm