Ego was a German automobile brand that operated between 1921 and 1926. The brand originated from Mercur Flugzeugbau GmbH, an aircraft manufacturer based in Berlin, which sought to diversify its operations following the end of World War I. In 1921, the company began producing light cars, introducing a model equipped with a 1016cc 4-cylinder engine of its own design. This engine was also available in a tuned version featuring a twin-carburettor,…