The buyer on the listing is Connecticut-based, if the tractor is registered there it will be easy to find.
When I saw this picture, I thought "that's some ghetto'd up 9-N." Well, now we know where Mr Lambo got his early design ideas from before he went into cars. The 1939 Ford 9-N: That's stock too, aside from front bumper-guard. The "high end" models came with the aluminum cowl. Pre-WW2. Whoever bought this for $5500 got a steal.
According to the urban legend, Lamborghini was taunted by Ferrari which resulted in him starting the car company. FWIW, Ferrari also makes tractors, but they actually bought a tractor factory. I learned all this today thanks to @wxytrader lol
Looking at all tractor listings on BaT https://bringatrailer.com/tractors/ it looks like the American machines don't gather much over 10-12k so 5k might be reasonable if it was not mint. In fact, here is another Ford from the same era: https://bringatrailer.com/listing/1944-ford-2n-tractor/