The story
Founded by Maurice Sizaire in 1920.1
By 1920, when they established Sizaire Frères, Maurice (1877–1970) and Georges Sizaire were well known in the Paris-centred auto-business. They had founded the auto-producer the Sizaire-Naudin in 1903, but left the company in 1912. In 1920 they were also still involved with Sizaire-Berwick, which may in part explain the three-year gap between the founding of their third automotive business and the appearance of its first car. The car itself was nevertheless more technically innovative than the Sizaire-Berwick products.
Around 1927, the business relocated the short distance to Levallois-Perret, and this was accompanied by a name change to Société Nouvelle des Autos Sizaire. A further name change, to SA de Gérance des Automobiles Sizaire, followed in July 1929. Production nevertheless came to an end in 1929, by which date approximately 1150 cars had been produced.
From Wikipedia’s article on Sizaire Frères, shared under CC BY-SA 4.0.3