You never know when you might come across a valuable error coin, so it helps to know what to look for. Here's a look at five ...

The 1943 penny errors represent some of the most fascinating and valuable mistakes in American numismatics. During World War II, the U.S. Mint switched from copper to ...

6. The Proof Coin Pops Finally, we have the proof coin errors. Proof coins are typically struck for collectors, and they usually have a mirror-like finish. But sometimes, these coins can have ...