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 ...

Most people keep quarters in a jar by the door, never giving them a second glance. They're just quarters. Twenty-five cents.

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 ...

A coin sitting in a jar or drawer could be worth thousands of dollars if it has a rare mistake from the U.S. Mint. Some 1999 state quarters from Georgia have sold for as much as $10,000 due to unusual ...

As with just about any asset, a coin’s value is determined by its market demand. This means that coins in short supply often see higher demand — and higher values. With coins, supplies are limited ...

Some 1999 Georgia quarters that were mistakenly struck on experimental planchets have sold for extremely high prices, reaching up to $10,000 in some cases.