revived French Air Force. Variants Unlike many contemporary French aircraft, production of the Potez aircraft was reasonably prompt and the first deliveries were effected before the end of 1938. The 63 had been designed with mass production in mind and as a result, one Potez 630 was cheaper and faster to manufacture than one Morane-Saulnier M.S.406. As production tempo increased, a number of derivatives and experimental models were also developed. Fighter variants A typical feature of the 630 and 631 was the frontal armament, which originally consisted in two 20 mm Hispano-Suiza HS.404 cannons in gondolas under the fuselage, though sometimes one of the cannons was replaced by a MAC 1934 light machine gun (LMG). Later in their career, 631s received four additional LMGs in gondolas under the outer wings, though it was theoretically possible to fit six. Potez 635 CN2night fighter project was cancelled Potez 63.12 C3with Pratt & Whitney Twin Wasp Junior radials remained a single prototype Potez 670-01Fighter prototype Potez 671heavy fighters were on the assembly lines when the Germans captured the SNCAN Méaulte factory near Albert. Prototypes Potez 63.01The first prototype Potez 630.01The second prototype Potez 630 CN.2 No.01Night-fighter prototype Potez 631.01The first Gnome-Rhone powered prototype. Trainer variants Potez 634A dual control trainer aircraft derivative of the 630 was proposed, which was simply designated as Potez 631 Ins (for instruction) 630 conversion with Gnome-Rhône engines Potez 63.16 T3A crew trainer derivative of the 63.11 with different, larger wings. Only one prototype was built. Bomber variants Potez 633 B2two-seater, light level bomber. The Potez 633 retained the fuselage, wings and engines of the 631 but the observer's position and cannon gondolas were deleted and a small bomb bay was added between the pilot and rear gunner. Front armament consisted of a single light machine gun in the nose. The bomb bay could house eight 50 kg-class or two -class bombs. There was no bombardier position, as the rear gunner was supposed to direct the bombing run through a periscopic bombsight fitted ahead of him, a disposition that proved unworkable in the field. Potez 633.01The first two-seat bomber prototype flew in late 1937. The Armée de l'air ordered 133 Potez 633s in 1938, but two months later decided all aircraft in the light level bomber category should be 3-manned, like the Douglas DB-7 and Bloch MB.175. The French order for 633s was converted into an order for more