I think you partly answered your own question. The tractor was purchased to fill the needs of your father. He chose the 5 speed over the 4 speed. Cost was surely a factor, he chose not to go opt for the live PTO that cost more and he did not need. Most 600 & 601 series were indeed 4 speeds as that was the base tractor and least costly. Many options remained including the 5"s 7"s 8"s, 9"s with many options that all added to the price. People chose what they needed and paid accordingly.
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