Generally, the Farmall Super A had the standard round axle (either adjustable or not). The International Super A (the commercial or industrial tractor) had the heavy duty square axle. But the heavy duty axle does occasionally show up on a Farmall. The International would also have a foot operated speed control, which is a small pedal between the 2 brake pedals. I don't think it was ever installed on a Farmall (at least by the factory). Many of the Internationals were sold for highway mowing. That use required a Touch-Control system and a PTO. Usually they also had a belt pulley attachment to run a knife sharpener.
Every one I've ever seen, The Farmall Super A had a serial prefix of FAA and the International Super A had a prefix of IAA.
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