The 20p piece is a rare “mule” coin dating from 2008, and fetched £90 at auction. The coin was minted without a date due to an error and quickly became a sought-after collector’s items.

We are all being urged to check our change after a rare Royal Mint 20p coin sold for 450 times its face value on eBay. The 20p piece is a rare “mule” coin dating ...

We are all being urged to check our change after a rare Royal Mint 20p coin sold for 450 times its face value on eBay. The 20p piece is a rare “mule” coin dating from 2008, and fetched £90 at ...

As a result, the year of issue was completely omitted, making these coins the first in over three centuries to enter circulation without a date. The back of the 20p coin (Image: Anderson & Garland Ltd ...