#1 is the first tiller. It was only like maybe 20" wide as a "base model" but you could add extensions. One, or two depending on the HP of the tractor running it. I don't know what the difference is between the #1 and #1A. The #2 was made as a "base model" the width of the #1A with both extensions. The #2B was the same as the #2 but could be used with either sleeve hitch set-up or Cat 0 3pt. Although when using it with 3pt, it didn't utilize the lift arms, just the rockshaft, and you had to use an adapter to connect the lower gearbox to the 3pt rear cover plate.
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