As it is so unusual it has meant the coin has been dubbed the "holy grail" of change collecting making it much sought after. The 20p coin was highlighted on Instagram by Coin Collecting Wizard.

An unusual coin could net its owner over 250 times its face value after an error when it was made. The rare 20p coin was one of an unknown number released by the ...

A RARE 20p coin with a tiny error has just sold for over 230 times its face value – and you could have one sitting in your change without even knowing. An undated ...

A rare 20p coin sold for a whopping £232 on eBay – over 1,000 times its face value. The coin, which features a rare minting error, had collectors scrambling to get their hands on it.

A rare 20p coin could fetch more than 250 times its face value to someone lucky enough to find one. Back in 2008 a minting error meant for the first time in centuries ...