Just tell Bev that Cub number 2 needed a big brother..
I think the 100 is the replacement for the A in the number series line of tractors. I have seen one or two and they are nice little tractors, but they just don't strike me like the Cub does. I think it is an aesthetic thing, for me anyways. I like the look of the Cub, and I like the look of the A and Super A, but not as much as the Cub.
Anyways, if you get lucky with the 100, I am sure it will probably be useful. Let me know if you get it, I may have access to a couple of manuals.