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The Curtiss Model H75O was a version of the Hawk 75 produced for Argentina. It was based on the Model 75H, which had been a demonstrator aircraft with a fixed undercarriage and powered by the Wright R-1820 Cyclone. The H75O used an 875hp Cyclone engine and was armed with six .30in machine guns carried in the wings.
Curtiss produced thirty aircraft for Argentina - one Model 75H and twenty-nine Model H75Os (Curtiss c/n 12769-12797), with deliveries beginning in November 1939. Argentina purchased a licence to build 200 more aircraft, although only twenty were completed, all during 1940. Some of these aircraft remained in service into the 1960s.