The original "Potez 630" was developed to meet this specification; two variants of the aircraft were originally submitted for consideration, one (the 630) powered by Hispano-Suiza 14AB radial engines and the other (the 631) with the Gnome-Rhône 14N. Other companies also produced submissions in response, including Breguet Aviation, Hanriot, Chantiers aéronavals Étienne Romano, and Loire-Nieuport. Each of the competing manufacturers were requested to produce a single prototype for evaluation at their own expense; work on the first prototype, designated as the "Potez 630-01", commenced in April 1935. In addition to the Potez 630, the same specification had ultimately resulted in the successful Breguet 690 series of attack aircraft.