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
12155 falls in the 1940 range, the second year built. Serial numbers listed here, are the first models serial number, at the beginning of that years production run. TractorData.com Farmall A tractor information