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Does that mean that the marks were there when they first made the die and then ground them off later?
The lines were on the die when it was first put into use and gradually faded away from die wear and subsequent polishing. The die was used for a long time and the lines are visible to some extent until the latest die state.
If the dies were able to clash hard enough to transfer the hair detail to the reverse die it would be down below the T in CENT and would be running upward from left to right.