1965 Dodge Dart Charger

It's Mylar stretched over (and adhered to) the base plastic.

Mylar Plastic Film (BoPET): "Whats It to You" 1955 Dupont 24min - YouTube

That is totally awesome Dan. I can't figure out how you got all this knowledge. Truly amazing and thanks for sharing it with the FABO community.

Now I have some leads to go for!