In 2013 to celebrate the 100th Anniversary of the Birth of Christopher Ironside, the Royal Mint released a Limited Issue Christopher Ironside Piedfort 50p Fifty Pence Silver Proof Coin struck in solid .925 Sterling Silver.
The reverse design features the Royal Arms by Christopher Ironside while the obverse features the Fourth Portrait of Elizabeth II by Ian Rank Broadley.
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.