E.SA was an Austrian automobile manufacturer founded by Egon Seilnacht in Atzgersdorf, Vienna, during the early 1920s. The company operated from 1920 until 1926, during which it produced a limited number of vehicles characterized by their conventional chassis design. The E.SA lineup included two models, distinguished by their engine configurations: a four-cylinder and a six-cylinder variant. Both models utilized side-valve engines, which were…