You have some really fine, old-iron in your collection. Nice to have you drop by and join our group. The Ingersoll name did not appear solely on these tractors until 1987. Therefore, anything badged as Ingersoll is relatively new. The Case badged tractors go back to 1965, shortly after your "Original" left the factory by a couple of years.
In a way, there are some parallels between the Cub and the Case tractors. From 1965 to 1977, the traditional Desert Sunset and Red color scheme was the order of the day but in 1977 the Desert Sunset paint was dropped. Sorta like the signature yellow/white of the early Cubs and the red series Cubs built at the end of the true Cub period. The Wheelhorse tractors are legendary and it's a damn shame that the line has died. It's tough to compete in a world that throws things away rather than repair them.
Please check out our Technical area. We have a lot of interesting reading in the FAQ's that should give you a head start on tractor knowledge. The forums speak for themselves when it comes to content.
Enjoy.