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The John Deere model GP was built in five distinct versions through the course of its production: 1  The standard-front GP, or John Deere Standard, built from March 1928 to February 1935. 2  The John Deere two-wheel tricycle-front GP, or GP-tricycle, of which twenty-three units were built between August 1928 and April 1929.
In 1947 John Deere introduced its first self-propelled combine, the model 55. It was soon followed by the smaller models 40 and 45, the larger model 95 and an even larger model 105 was introduced in the 1960s.