I recently helped a couple of friends pull a Farmall C out of the woods that was sitting there for 20 years (before it was 'woods'). Surprisingly, the engine isn't seized up. The main issues are that the carb is shot, a rim is rusted, the clutch is frozen, the fuel tank has a rust hole, and the starter needs to be replaced. Of course, the tires are not likely to survive the restoration. They guy fixing it up is a miracle worker with these tractors so I'm looking forward to seeing it get brought back to life. Forgive the fuzzy pictures. The humidity was brutal that day.
On the back of the tractor at its last breath was an older vintage Deere Model M manure spreader, which we went back for yesterday. It's in pretty tough shape and we aren't sure about its prognosis.
I can't believe someone could leave something like this sitting for so long.