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Happens a lot on the 80's cents. It happens only on the Zincolns. Must be an issue with the single squeeze dies.
Happens on copper cents and other denominations as well, but is much scarcer. It is common on Zincolns. Not an issue with the single squeeze dies as it is common on Zincolns all the way back to 1982 and the single squeeze dies did not come along until around 1997.