In 2016, to celebrate the 90th Birthday of Her Majesty Queen Elizabeth II, the Royal Mint released a Limited Issue Queen's 90th Birthday Piedfort £5 Five Pound Platinum Proof Coin struck in solid fine 999.5 Platinum.
The reverse designed by Christopher Hobbs depicts a circle of roses and 'E II R 90' in the center while the obverse features the Fifth Portrait of Queen Elizabeth II designed by Jody Clark. Piedforts are coins which have been specially struck on thicker than normal blanks.
As their name suggests they are closely associated with France, where from the twelfth century they were apparently issued by the Kings as presentation pieces.
In Britain the practise of striking piedforts is later and less frequent, but medieval and Tudor examples are known.
Royal Mint Product Code - UK1690PL