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 ...

A rare coin expert has advised people to be on the lookout for a particular 50p coin that could potentially be worth a lot more than face value due to a minting error ...

A coin is only ever worth what someone is willing to pay at the time though, and demand can vary over time. Previously we've spotted the coin going for as much as £230. Rare coins could sell for ...

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 ...