Brits are being urged to check their pockets as the Royal Mint reveals the rarest 50 pence piece which can be worth more than 200 times their 'face value'.

Although this seems a lot, other 50p coins are known to have much higher mintage figures, such as the 1997 Britannia 50p with more than 456 million released. But how much are they worth?

Each coin had five million pieces released into circulation. Although this seems a lot, other 50p coins are known to have much higher mintage figures, such as the 1997 Britannia 50p with more than 456 ...

According to the coin manufacturer, the UK Pride 50p, the Platinum Jubilee 50p ... for instance, the 1997 Britannia coin had a whopping circulation of over 456 million. This inevitably sparks ...

According to the Britannia Coin Company, the Atlantic Salmon coin has been sold for around £150, or 300 times its face value. This makes it the most valuable 50p coin currently in circulation ...