The Alvis 12/50 is a car introduced by British business Alvis Car and Engineering Company Ltd in 1923. It went through a series of versions, with the last ones being made in 1932. A range of factory bodies (made by Carbodies and Cross & Ellis) could be specified in two- or four-seat form, with either open or closed bodies.
The subframe cars
SA and SB
The first 12/50s were produced in late 1923 for the 1924 model year. The cars from this first year of production were designated SA and SB. The SA had a 1496 cc four-cylinder overhead valve engine in a chassis with a wheelbase of 108.5 in, while the SB had a wheelbase of 112.5 in. The SB was initially fitted with the 1496 cc engine, but after the introduction of a 1598 cc version of the OHV engine this became the standard fitment. The engines of these early cars were carried in a subframe bolted to the relatively slender ladder chassis. The SA usually carried two-seat bodywork, typically the Super Sports 2/3-seater nicknamed "duck's back" because of its pointed rear end, said to resemble that of a duck. The majority of SB cars carried Super Sports four-seater bodywork, but a good number were also fitted with touring bodies from the standard Alvis range. The SA and SB 12/50s were built with (twin shoed) brakes on the rear wheels only. All the 12/50s had a four speed non-synchromesh gearbox with right hand change. The clutch was a fabric-faced aluminium cone. The cars were right hand drive.