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Originally Posted by jessash1976  I guess I don't remember the whole process, but going by what you just said, it would still be possible for the MM to be MD independently because like you said, the OBV and REV are already in place before the MM. So, what is the next process. From what limited knowledge I have, I think MM were added to the die starting in 1990. |
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Machine doubling is a striking effect - it occurs as the dies are separating after the coin is struck. The mintmark was definitely part of the die. What you are thinking of is after 1990, the mintmark was no longer hand punched into the die, eliminating RPMs.
