After the official withdrawal from Grand Prix racing, the great constructor Giochino Colombo complained that too little was being done to present the Alfa Romeo brand in the right light. The idea was to produce another sports car that would put the name Alfa Romeo back in the newspapers. This time it was to be something completely new! In 1952, Colombo built five prototypes under the name 1900 C 52, which were quickly renamed Disco Volante (flying saucer) due to their striking shape. This report looks back, describes the vehicles and shows rare historical and current photos of the rare vehicles.