The Topolino was one of the smallest cars in the world at the time of its production. Launched in 1937, three models were produced until 1955, all with only minor mechanical and cosmetic changes. It was equipped with a 569 cc four-cylinder, side-valve, water-cooled engine mounted in front of the front axle, (later an overhead valve motor) and so was a full-scale car rather than a cyclecar. The radiator was located behind the engine which made possible a lowered aerodynamic nose profile at a time when competitors had a flat, nearly vertical grill. The shape of the car's front allowed exceptional forward visibility