My Grandpa, on my Mom's side had a Ferguson, but wasn't all gray, it was gray and red. It was a 20, did they make a TO-20? That's what I seem to remember it being. Sickle mower, brush hog and blade. He also had an Allis "G", the small one with the engine in the back. He just used it with a trailer, and it tended to rear up going uphill.
My uncle also had a couple of Oliver crawlers, one the standard one, and the other was extra wide, and a Super 55 oliver, built like an 8N Ford on steroids.