In general, a 1930s Fiat petrol tractor in good condition can be worth anywhere from $5,000 to $20,000. However, some rare or well-maintained tractors may sell for even higher prices. For example, a fully restored 702 recently sold at auction for over $30,000.
If you're interested in purchasing a 1930s Fiat petrol tractor, it's important to do your research and carefully inspect the tractor before making an offer. You should also be aware of the potential costs associated with owning and maintaining a vintage tractor, including fuel, repairs, and insurance.