A rare coin could be the key to a small fortune, and it's been causing quite a stir recently. Whether it's the one penny piece hailed as the 'rarest in UK history' or an unusual 20p with a design flaw ...

Certain coins can fetch a hefty sum, even if it is one detail that makes collectors go wild for it. But it's no secret specific rare coins are more desirable than others, whether it's a 20p or 50p.

The "rarest £2 coin you can find in your change" is what all collectors want. It features a key detail in British history and boasts a mintage of 485,000, so do you have one?

The coin, which features Queen Elizabeth II on the front and the Nations of the Crown design on the reverse, sold for well over its actual value ...

This £2 coin which is missing two designs due to a print error, has sold for £69 on eBay.