Plating issues. The mint stopped adding the mintmark to the working dies after 1989, thus preventing repunched mintmark varieties from occurring after that date.
I'm afraid I don't follow. Are you suggesting that this coin is a repunched mintmark? Plating issues were quite common in the early 1990s, especially around the mintmark and in certain parts of LIBERTY.
Ahhhh. This was the type of coin that brought me to CT in the first place. That ny friend is a plating issue.
Due to a split in the plating air has gotten to the zinc and it has started to rot. eventually the mint mark will fall off and there will just be a big crater there.
Might not be obvious in the photo, the area that looks like a second D same size to the East SE - Under the main MM is stamped into the coin, yet under the MM That extra stuff at the SE of the main d seems to have filled in during the minting to try and remake some of the lost field. This may have been a damaged planchet prior to minting.
I assure you that the coin is exactly as I described. If you use a toothpick carefully at the point under the MM the copper will peal back to reveal rotted zinc.
