I may be uniquely positioned to testify on your question. I own one of the first SMTA's (60177) and one of the last 660's. These two tractors would represent the entire production life of the planetary IPTO.
As far as I can tell, the only difference on the 660 is the long operating lever and linkage, as well as the rear plate for attaching a right angle gear box. That plate was first used on 300 Utilities that couldn't be fitted with the side mounted belt pulley.
Otherwise, I don't think there is any difference but I will look tomorrow and add to this thread if there is.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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