what the scan doesn't show, is that the 7 fades off to nothing really fast. Also the 9 fades as well. Starts out as a full strike then gets smaller and smaller (height wise).
I bought the 1999 mint sets years ago and thought the same thing about the marks on the coins. But they are regular coin run and put into the sets. Nothing special as far a handling like you expect from a proof set. They are what they are.
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