In 2018, to celebrate Four Generations of Royalty, the Royal Mint released a Limited Issue Four Generations of Royalty Piedfort £5 Five Pound Silver Proof Coin struck in solid .925 Sterling Silver.

The reverse designed by Timothy Noad features the four initials of the current Four Generations of Royalty and represents the heritage of the House of Windsor while the obverse depicts the Fifth Portrait of Her Majesty Queen Elizabeth II designed by Jody Clark.
These legal tender coins have been struck to proof quality using specially prepared dies and highly polished blanks.

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.