Yes, a rear PTO was offered on gear drive cubs through the quietline series. Then, only on the SGT later on. You are correct, the clutch would disengage the rear PTO, but it is still considered "live". It technically is a "non-independent live PTO" as it couldn't run with the clutch disengaged. On large tractors, there were two speeds of PTO's available, 540 RPM, and 1000 RPM. I'll get to that in a minute.
Harvester didn't make many attachments for the older tractors, if any, that were driven off the rear PTO. It was offered for the purpose of being used on the farm. I know of several farmers that used their cubs to run augers, bale elevators, water pumps etc. The biggest problem with them was, because the transmission was taken from a Farmall cub, then had a gear reduction added to it, and a smaller motor, this made the rear PTO turn in reverse to it's larger tractor counter parts. So, it made using the PTO more difficult, as you either had to reverse the drive on the equipment you were going to use it on, or buy a PTO reverser that was offered mainly by M&W. These reversers are hard to come by and can be quite expensive. But, they allowed the user to utilize the PTO as it should be. The M&W reverser also utilized the standard size 540 RPM PTO shaft as it's output. The PTO shaft on the back of the cub was a smaller, less common shaft.
The ones offered on the SGT was slightly different. It was an "independent live PTO". It did turn the correct direction, however, it ran at 2000 RPM and used a very odd female output shaft. Adapting and using these PTO is difficult as finding the correct shaft for the equipment is hard, and they turn too fast. But, IHCC/CC did make mowers and tillers for these tractors.
Some people consider them only good as a novelty. I, however, disagree. If you build equipment that can be run the direction that the PTO turns, or have the knowledge of how to make it work, they are EXTREMELY useful!
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