The CAMS-37 (for Chantiers Aéro-Maritimes de la Seine) was the third production model of a company which from its inception in 1920 only saw limited success. Partly derived from the CAMS-33, the model 37 coincided with a change of direction, including the new chief designer Maurice Hurel, from 1923. He worked from a new design office in 1924, with the French Navy requesting a four-seater amphibious flying boat usable for training, reconnaissance and other tasks, powered by a 9-cylinder Gnome & Rhône Jupiter radial, in a pusher configuration. Long story short, the CAMS-37 was accepted in 1926 with orders of both an unarmed trainer and an armed reconnaissance version, with a production from 1928 to 1937 and 332 seaplanes in total. Some were still in service when WW2 broke out, the last active in 1942.