Where would you find serial number on 1929-1939 Farmall F-20 tractor?

The serial number for a 1929-1939 Farmall F-20 tractor is located on the left side of the engine block, just below the cylinder head. It is stamped into the metal, and may be covered in dirt or grime. The serial number will consist of a series of numbers and letters, and is typically 12 characters long.