This rare coin is known as a 'mule' 20p as it has no date on either side - and it is thought there could be thousands more in ...

due to an oversight that paired an old heads side design with a new tails one, leaving the minting date off in the process.

A TINY unremarkable error on your 20p coin makes it worth 485 times its face value as a fiery eBay bidding war reveals. One ...

We are all being encouraged to check our change after a rare 20p coin sold for 485 times its face value this week. The 20p piece is a “mule” coin dating from 2008 and was minted without a date on the ...

The 20p piece is a “mule” coin dating ... A mistake in 2008 led to the old format being used on the Queen’s side and the new format being used on tails side. As a result, the first batch ...