i believe it is a 5020 somewhere in the '65-6 range as I drove enough of that style tractor (they're difficult to tell apart if redone. 5010, 5020, 4520) but the hood/grilles were the same from 110 up to 5020!) belongs to an elder relative that keeps it at our shop. i think it was orig picked up at a dealer in WI by a guy that pulled in NYS (orig had the monster truck tires, add'l. brackets, etc.) but it was returned to normal 18-20in duals and put back to use. It may be Kinze orig work as it is a Detroit Diesel. w/ orig straight pipes, needed hearing protection when starting up indoors and outside w/ the throttle above idle. (One owner claimed that if operated close to the barn or pasture, it'd scare the cows and reduce milk production!) Now, with small mufflers, everyone is just aware it is operating! He used to use it in the fields, but then started buying feed when the fuel prices went up. fam spend a lot of time charging/switching batteries around, using a little starting fluid, and filling tires after winter when it needs to be moved! the tires are not loaded and it slipped a lot while plowing, so we use smaller, simpler properly-ballasted machines (i.e. 60-130 Hp) to get work done with less fuel, compaction and with ears still in-tact! Owner is retired, lives a couple hrs away and never mentions the tractor. LOL 'hope he keeps it that way. Other relatives joke that if he has early dimentia, I should trade it back to him for some of his original workhorses! They go for about 25K in this shape today; some w/ cabs and canopies even more. can get orig in working order but in-need of restoration for about 10K-15K.