The are added to the coin. People created these to sell the the rubes that buy odd stuff. No premium, to a collector it is a damaged coin. People have been damaging coins for years. Back then when they were silver, it make a good backdrop as a "Love Token". When they realized they were just common cents, they spent them. You found one of them.
Do a search in the upper left hand corner of every page here on CCF, search on "counterstamp" and see all the many examples CCF members have shared, some are amazing! Some people collect these, to others it's just damage (to each their own).
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