Classic cars are older models that have accumulated a certain amount of popularity for various reasons, such as certain engine peculiarities or fame through movies. The old Volkswagen Beetle for example is a classic car.
And while Freshprince certainly has gorgeous cars (I've downloaded most of them) and many of them are considered classics in their own right, most of them are newer models and the OP has already specified that he/she is looking for cars from the early 20th century. Sadly all the cars from Frehprince's site, except the decorative car you've already linked to, are younger than 1940.
Sorry, Simwiz, but I don't know where to find cars from that timeframe either, just thought I'd clarify. But if anyone does know, I'm very interested too.