Who knew it was illegal? Lots of old Cadillacs roam the streets of Havana, even today. Prior to the new law that goes into effect on Saturday, car sales in Cuba had been restricted and limited to cars built before the 1959 revolution. Cuba's streets are about the only place in the world where you find a multitude of classic American cars, many big finned Cadillacs, with most in disrepair. There are lots of Chevrolet Belairs and Chrysler Imperials too, all from the 50's. Under the new law, buyers and sellers must each pay a 4% tax and sign a sworn declaration that the money for the purchase was obtained under legal circumstances. The new law allows the sale of cars from all models and years.