I'm not Bob, but maybe he won't mind.
I have the Service and Parts Manuals for 66A1-12015 and all are shown to have the planetary reduction gearing.
Production went to 66A14593 but I doubt they changed that late in the game.
Maybe early experimental had all spur reduction??
I don't know. Any 66A's I have seen had planets.
Later Bob
Thanks guys I'll try to post the letter when I can figure out how to do it. Kevin
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