The Alfa Romeo 1900 sedan was designed by Orazio Satta in 1950. It was Alfa Romeo's first car built entirely on a production line and was also Alfa's first monocoque production car. The 1900 was offered in two door or four door models, with a new 1884 cc, 90 bhp, 4 cylinder twin cam engine. It was spacious and simple, yet quick and sporty. Production continued until 1959, a total of 21,304 were built. The chassis was designed specifically to allow coachbuilders to rebody it, the most notable of which was the Zagato designed, 1900 Super Sprint Coupe, with an improved engine and custom body design. The 1900M AR51 or "Matta" is also a 4wd off-road part of the Alfa 1900 family.