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.

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.