Add Yahoo as a preferred source to see more of our stories on Google. Peter Gudella via Shutterstock Minting coins isn't exactly an exact science. Even though most ...

Most people who come across a Kennedy half dollar assume it's worth exactly fifty cents, maybe a little more if it's silver.

Some of the rarest and most valuable coins in U.S. history owe their worth to minting errors that slipped through unnoticed. Coins like the 1943 Copper Penny, struck in copper instead of wartime steel ...

Collectors really prize these coins because they show a unique minting mistake. Condition matters a lot here—well-preserved ones sell for much higher prices. I’ve seen some of these coins go for tens ...

If you are a rare coin collector, you know that it’s not always the perfect coins that are the most valuable. There are many criteria that make a coin worth lots of money in today’s currency, as well ...

An easy-to-miss ‘significant’ error by the Royal Australian Mint has resulted in a batch of $1 coins skyrocketing in value.