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 ...

For a Lincoln cent, however, the 1943 copper penny is extremely valuable, with circulated examples selling at auction in the past two years bringing between $240,000 and $336,000. Its auction prices ...

7 million, though even more recent sales have shattered those numbers. A small number of bronze planchets left over from the 1942 production remained in the mint presses and were accidentally struck ...