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 GOLD BRITANNIA around Britannia seated fused before the Union Flag. Below the date
Reference
United Kingdom. 50 Pounds (Gold) 2011, The Royal Mint. CoCo GB-2011-0017.