Leroy, I think it is just because they are such an interesting tractor in the way they start, look and sound. An older fellow from Colorado once told me that if you collect Caterpillars you either have a Sixty or you want a Sixty, I'd guess that pretty well sums it up.
Jim
George, i have a 60 , thanks though. It is interesting that the second most made gas caterpillar is worth so much verse the very rare machines. There still must be 3000-6000 still around . thanks leroy
You guys are right on the have or want, but cause I can't afford the sixty, I'm after a thirty. Easier to haul too. John