C101E is part of a model number. The C at the beginning means that it's a 3000 series. The E at the end means that it's a Select-O-Speed transmission, but there's not enough numbers in between to make a full model number, but I'll guess that the digit just before the last E is missing and that it's either a 4 or a 5, indicating either single or dual speed independent PTO, as all S-O-S tractors had one or the other (or no PTO, which is very rare), so I'll go out on a limb and say that the "10" after the C is for a general purpose ag chassis and the second 1 is for a diesel engine, and the real model number is C1014E or C1015E.
9C12B means that it rolled off the assembly line on March 12, 1969 during the day shift.
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