All three of the tractors you mention would have hwd the seat offset to the right, the left final drive up hard against the side of the tranny, and an offset wide front.
Look around in the photo links to the left of this page, and you may be able to confirm or eliminate the Cub. For description, the As and 100s have a teardrop-shaped fuel tank. The Cub the rear of the tank is more like quarter-sphere. The Cub also is a flathead motor.
Between an A and a 100, a clue might be some odd holes in the hood. As and Super As had decals for the Farmall, model decal, etc. On the 100 they were emblems that mounted to the hood. If those empblems are issing, there would be small holes on either side of the hood where they wre fastened.
You might also scrape away the crud on the side of the block, just under the front (#1) spark plug. There should be a machined flat spot there that will have the motor serial number stamped into it. That could give you as clue, as well.
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