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 from 2008, and fetched £90 at ...

A minting error on a small number of 2008 twenty pence coins has made them highly desirable, with some expected to sell for ...