I remember that stuff from when I was in high school. Black can, red and white printing - Classic - in script. It was a job to buff that wax off. Once applied, it became a permanent part of the paint

. I used to buy it from an accessories place in L.A. - Vilem B. Haan (I was always embarrased to drive my POS Pinto there

. Mostly, there were Porsche's and Ferrari's in the parking lot.) After Classic, I started using Collinite Wax, and then changed to One Grand Blitz Wax - which I have used ever since.
All that said, I think Classic Car Wax has disappeared, long-ago.