Aston and Morgan ): between 1921 and 1939, 350 Astons were built; 323 Frazer-Nashes in the period 1924-39. [4] By the end of the 1920s, AC produced a 2 liter six, the 3.5 liter Nazzaro had a three-valve OHC (only until 1922), while French makers Amilcar , Bignan, Hispano-Suiza , and