IH Farmall 656 gas/ IH 240 Utility/ 2, Super C Farmalls/ 2, Farmall A's/ Farmall BN/McCormick-Deering OS-6/McCormick-Deering O-4/ '36 Farmall F-12/ 480 Case hoe. '65 Ford 2000 3 cyl., 4 spd. w/3 spd Aux. Trans
Look at the right front corner of the engine block above the magneto/distributor drive near the head. There will be a flat boss there. On several of my tractors, including one Suer C, the S/N is stamped in there and all match the S/N stamped in the tags. You may have to clean/scrape/sand/brush to get paint, etc. off but there should be a number there.