During the late 1930s, the Potez 630 received considerable foreign interest; in addition to France, many countries were in the process of re-equipping their air forces. One such foreign venture was the acquisition of a licence to manufacture by the Czechoslovakian aircraft firm Avia to produce a variant of the aircraft, designated as the "Potez 636"; none were completed prior to Czechoslovakia's annexation by Nazi Germany in 1938. In 1938, a further 50 additional Potez 631s were ordered, of which 20 were to be diverted to Finland, although they never reached that country. A number of firm foreign orders was placed with SNCAN for the type; the Republic of China ordered four Potez 631 and five Potez 633, the Kingdom of Yugoslavia ordered two Potez 630 and one Potez 631, the Kingdom of Romania ordered 20 Potez 633, the Kingdom of Greece ordered 24 Potez 633, and Switzerland ordered one Potez 630 and one Potez 633.