With coins, supplies are limited either because they are very old, were minted in very limited supplies, or contain errors or other distinctive features that set them apart. Errors are common ...

Your 20p piece could be worth a lot more than you think - if it has this very rare error. One expert has urged people to ...

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 ...