Model 320 tractors were built in two distinct phases. Phase 1 had a vertical steering wheel while Phase 2 had a slanted steering wheel. 2,566 Phase 1 tractors were built and 518 Phase 2.
Serial number 320001 was the first Model 320, built June 25, 1956.
Serial number 325518 was the last Model 320, built August 2,1958.
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