Or how about a penny that's got Lincoln's profile on one side but looks like a dime on the reverse? Coin errors are a ...

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 ...

You never know when you might come across a valuable error coin, so it helps to know what to look for. Error coins can be divided into the following general ...