It looks like they forgot to advance the number on the one transmission and corrected that with the second stamp.
Here's the transmission stamp on my very early 1967 Corvette #350. This was the first year they used the letter S in the transmission on Corvettes. Of course, they forgot to advance the numbers for the transmission to 350. The Warranty Plate date of manufacture for the transmission matches the date on the transmission and the unit has never been out of the car. I'm sure this was not at all uncommon. Thank goodness they got the pad stamp correct.
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