ELIZABETH II D G REG FID DEF 50 POUNDS around the effigy of Elizabeth II facing right with a crown. On the lower end of the shoulder the initials of the engraver
Description reverse
1/2 OUNCE FINE PLATINUM BRITANNIA around a standing Britannia wearing a corinthian helmet. With her left hand she leans on a shield a shield with the Union Jack. In her right hand she has got a trident. The fluff of her robe is transforming into waves.
Reference
United Kingdom. 50 Pounds (Platinum) 2008, The Royal Mint. CoCo GB-2008-0020.