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Most over-polished dies come from the Denver Mint in Colorado and most of the examples are missing part of the coin's normal design. They also display "abraided" die characteristics (from over-use) because these Mint Errors were the result of the Denver Mint, extended the life of the working die, to save money.
So mint employees would file the dies. Often, this resulted in some areas of the die to be poorly struck and missing certain parts of the coin's design.
1922 No D Lincoln Cent was caused by an over-used die being filed at the mint.