http://en.wikipedia.org/wiki/Antique_car has a timeline at the bottom of the page. Top line has been around since around 1960 (with the exception of "modern". WWII seems to be the dividing line between "cast in concrete" and "moving". Suspect that the 1950-1970 era should be "steel", 1970-1981 "plastic", and post 1981 "computer". Padgett