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.

the 20p definitive design changed from the Tudor rose to the shield. And you can see on the Tudor rose coin the date is actually on the front, so there was no need for a date on the obverse head ...

Brits have been urged to check their change for a seemingly ordinary coin that could be worth 300 times its face value. According to an expert a number of 20p pieces could fetch up to £60 each ...