That price is a steal. I have 3 oliver 80 standards I paid $500-$1000 us for each and I got good deals as well. I did see an Oliver 80 standard at auction go for $2900, almost fully restored but still missing the intake and exhaust manifolds. Manifolds you can buy new for $550. So he had at least that much more to spend on it. My tractors range from one stuck complete, one restored and one original but all legible decals and original paint and tires. 

This cockshutt 80, does it say cockshutt hart parr 80 or is hart parr just at the bottom of the serial number tag saying hart parr works? I have seen alot of these tractors. This tractor would be green with orange wheels. Later tractors were red with cream wheels. If it does say Cockshutt Hart Parr 80 it should have Cockshutt Hart Parr on the radiator. I believe it being a 1939 it should just say cockshutt on the radiator and Cockshutt 80 on top of the serial number tag. I'd buy it as fast as you can if you haven't already though. Good luck , if you need any parts let me know. Adam