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Allis Chalmers 616. In 1972, Allis Chalmers also introduced their Model 616. This was their former Simplicity PowerMax. It had orange paint and the hood was a different color. It quickly became the 620 and by 1973 it had 20 horsepower engines. by 1975 it was relabeled to the 720 in order to match the numbering of their now updated small tractors.