The F-series tractors survived until 1938.  In 1939, International Harvester introduced the “letter series” of tractors, which were designated A, B, BN, C, H, and M.  Another smaller tractor, known as the Cub was also introduced.  At the time of the introduction of the Letter series, International Harvester’s commissioned industrial designer gave the Farmall a new, updated look.  The letter series offered a wide range of options and power.  The H line was the most popular.  The Letter series was updated to the “super” series in 1952, and received many improvements.  The Letter series of Farmall tractors was produced until 1954, and was a defining product line in the history of International Harvester.

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