Cookiemonster, you are correct. Mint marks were hand punched up to 1989. That's why re-punched mint marks don't exist from 1990-present. As for the OPs coin, it looks like MD. Notice how it is happening on he date as well? It's also flat and shelf like. Happy hunting!
-CH27
Collector of U.S. Coins, Varieties, and Colonial Coinage
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