Royal Mint 2011 Britannia Masterpiece Medal 250g. 999 Silver Medallion Box COA LIMITED EDITION! This Royal Mint 2011 Britannia Masterpiece Medal is a stunning 250g. 999 silver medallion that comes boxed with a certificate of authenticity. It features a beautiful design of Britannia and is a rare find with a certification number of 433/500. The coin was minted in the United Kingdom and is considered uncirculated. It is a great addition to any coin collection and is sure to impress any enthusiast. MEDAL CONTENT: 8 TROY OUNCES.