Environmental damage. The copper layer isn't missing. There is a gray layer (from the moisture in the bottom of a cup holder maybe?) covering the coin. You can see brown showing through where the gray has been rubbed away.
Words of encouragement are one of the major food groups. We need to consume them regularly to thrive and grow.
Easier to tell in hand, zinc doesn't hold up as well as copper so they spot quite fast. Does the coin have luster in hand? Always the easiest way to tell, as the zinc will have luster if it isn't too far gone.
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