In 2003, the British Royal Mint on behalf of Alderney issued a £1,000 gold proof coin to honour the twenty first birthday of His Royal Highness, Prince William of Wales.
The issue limit was extremely low with a mintage of just 21 pieces.
Diameter = Diameter in millimetres.
Weight = Weight in grams.
Alloy = Fineness of gold.
AGW = Actual Gold Weight in troy ounces of pure gold.
One Kilo = 32.15 Troy Ounces.