Every day, millions of coins and bills change hands across the United States, most of them holding only their face value.

Since the government first started to circulate pennies, it has minted more than 300 billion, and today, we have about 150 billion in circulation. You could circle the Earth with them 137 times.

These pennies are rare and therefore can be worth more than one cent -- in some cases, much more so. Here's what to know if ...

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