In 2017 to celebrate the 375th Anniversary of the Birth of Sir Isaac Newton, the Royal Mint released a special Limited Issue Sir Isaac Newton Piedfort 50p Fifty Pence Silver Proof Coin struck in solid .925 Sterling Silver.

The reverse designed by Aaron West while the obverse features the Fifth Portrait of Her Majesty Queen Elizabeth II 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.

Royal Mint Product Code - UK17INPF

• Limited Mintage Presentation of 1,985 Coins Worldwide
• Piedfort Double the Thickness and Weight of its Standard Counterpart
• Finished to Royal Mint's Proof Quality in Solid .925 Sterling Silver
• The only Official UK Coin to celebrate this Scientific Genius
• Celebrating the 375th Anniversary of the Birth of Isaac Newton
• Celebrating one of the most famous figures ever to hold the role of Master of the Mint, author of the single most influential book on physics ever written
• Royal Mint Boxed with Certificate of Authenticity