The T in STATES looks normal but it does seem to have a tiny die crack going to the A. There's no pic of the UNITED so I'll just take your word that it's different.
The reason the mint mark is filled is because the post that would form the center of the mint mark has broken off the die. It even removed part of the base of the post. Thus the filled area is above the mint mark.
The die is showing its age. Note how the devices are starting to flow/connect together on the outside devices. A spendable coin.
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