If the serial number is 720000 and above it will be aluminum and made by Cub Cadet Corporation(CCC). CCC was the premium line of equipment for Modern Tool & Die (MTD). I wouldn't let this change your decision on the purchase because under normal use they work fine. The red Cubs were the last series to be made by IH when production ended in April of 1981. I think the cast rear has 7 bolts on the cover plate and the aluminum has 9.
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