The Mikrus MR-300 was one of the only Polish-built microcars designed for the masses. Assembled from spare production capacity by aerospace manufactures WSK Mielec and WSK Rzeszów, only 1,728 were produced. It weighed 472 kg (1,041 lb), featuring a two-stroke, 2 cylinder, 296cc (18 cu.in) inline engine, carburetor fed, 14.5HP propelling the vehicle to a maximum speed of 90 km/h (56 mph). The Mikrus MR-300 existed from 1957-1960.