I'm guessing that any good condition such tractors would sell for more than their practical worth as they would be a collectors item. Most of them are worn out, used, abused and sloppy. Maybe OK for pulling an occasional trailer around the yard.
I saw a similar era MF 135 or similar size at my mechanic. Some guy paid a few grand at an auction and will now pay another ten grand (CDN) on motor work, steering box and other stuff. They were GREAT tractors, but just not worth that kind of money.