Hey bub, I just made a lucky find - the first commercially made slot car, from the German firm Bub, in a 1953 set with a single-lane track! No real scale or car model that I can tell. It's about 3-3/4" long and 1-1/2" wide. Plus the body is made of bakelite...
For a look at the set, go to Bernards slot car museum:
http://bernardsslotc...tures&man_id=86
Don