In Puławy, Poland, it's 70s and 80s Polish classics, Mercedes-Benzes, and BMWs. Outside of that, you only have some oddballs (Beetle, Herald, Charger, etc.).
In Kragujevac, mostly Zastavas 750s, Zastavas 101, VW Beetles, etc. In other parts of country, there are Minis, old Peugeots (404 and 504 primarily), some American cars, Mercedes, NSUs, etc.
You tend to get lots of old british vehicles (mainly 70s) near me. Most of the common ones are Morris Minors, Triumph Spitfires and Austin Healeys but Minis are also quite common
Classic cars are sadly not too common here, but the most common (according to me) are either Town Cars from the 80s or the classic Beetles (named here as VW 1300).
Most common classics in my area: Ford Mustang, Chevy Corvette, Pontiac GTO, and Pontiac Trans Am. I've seen so many of all of them that they're kind of boring to see around. Some of the rarer classics I've seen though are the Skyline R32 and Datsun 280ZX.
In my area I think the most common are Volkswagen Beetles, Toyota Crowns and Toyota Coronas. Classic cars are uncommon here though.