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Twelve Curtiss Model H75Ns were ordered by Siam (Thailand). These were similar to the Model 75Ms produced in China, with a non-retractable undercarriage and powered by an R-1830 Cyclone engine. They were armed with six machine guns, two in the nose and four in the wings. Deliveries began in November 1938. The aircraft fought in two brief conflicts, first the Thai invasion of French Indo-China in January 1941, and then the Japanese invasion of Thailand in December 1941. The surviving aircraft were then taken over by the Japanese. One aircraft is now in the Royal Thai Air Museum, Bangkok.