Which motor car company manufactured the Speed 20 series of automobiles in the 1930s?

Alvis Car and Engineering Company Ltd was a British manufacturing company in Coventry from 1919 to 1967. In addition to automobiles designed for the civilian market, the company also produced racing cars, aircraft engines, armoured cars, and other armoured fighting vehicles.

The name Alvis had no particular significance; it was chosen by the founders of the company as it sounded good in any language. The cars established a reputation for both quality and performance with Alvis producing 6937 cars prior to WWII.

The Alvis Speed 20 is a British touring car that was made between late 1931 and 1936 by Alvis Car and Engineering Company in Coventry. It went through four variants coded SA to SD.