Case 450
I forgot all about how much I worked with and on one of the Case 450's when I was in college working for the US Feather Service in Wyoming. Your pictures brought back memories of that. I rode a seedling planter off the back planting lodgepole pine seedlings near Bondurant for parts of two summers. Beat me silly when it was out of the ground and tore up the Case. As I remember the planter was really much larger and heavier than it should have been for that machine. We had to replace the carriage rollers for the tracks each year, what a PITA, always in the woods with minimal tools. The operator was an older gentleman so guess who got to do all the heavy work, and crawl under it.
We got it stuck once in what appeared to be dry ground that was just a crust on top of saturated soil. The rear of the tracks at the drive sprocket were completely buried. It took a 12 foot 10" log chained to the tracks to walk us out, thank goodness for it's hydraulic blade so we could lift the front of it up enough to chain the log to the tracks. Took us about 2 hours just to get out of the hole.