A-B-C should have the chassis number stamped into the engine on a small flat area I believe it's above the distributor or magneto as long as the engine hasn't been switched. My C engine and chassis tag match.
Let me add the casting number probably wont match exactly, but should be within a couple of months of each other. The engine number may or may not match even if original to the tractor, but should be close enough to get the year model.
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