After engineer higher Vitorrio Jano of the notch designed the large successful runner of P2 Prix, it turned to the design "a cheap light car with the brilliant execution". The new car was completely a departure with the cars earlier of the road of sparte, than all of large "furnaces" used and "sixes". At the beginning shown in Milan Motorshow 1925, that always took two years before the 6C 1500 would be available for the many eager customers. It was the beginning of a chain of the sports cars designed and strongly successful of D Alfa Romeo de Jano.