Doesn't look bad, gas or deisel?
Any leaks, trans/clutch feel solid, hydraulics, aux. hydraulics?
Though $3500 doesn't sound bad for that tractor but that one does not have power steering and I think for a little more or the same price you could find a comparable tractor with power steering. If you are wanting something that size and similar price range you might also look at the Internation 606, MF 135, 150 or 165, Allis Chalmers 160 or 170, John Deere 2020 or 301A, or even a Ford 4110, 3910, or another 4000.
If you are wanting one with a loader in that Hp range and are willing to pay a bit more then PM me.