O'Brie and I remember the days of chassis like these back in the 1960s. Just about all commercial American slot cars of the period had chassis along these lines.
Quite a variety there. I remember the Riggen brass type ones quite well. Had one , complete with sponge tyres, which I got from Peter,narrowed and shoe-horned into an Escort Mk 1 body. This body is the same one currently being used on my Scratch Built class Escort Mk 1.