This 1oz 99.9% pure silver proof coin commemorates the 21st birthday of Prince William on the 21st June 2003. The official colour photograph of H.R.H. Prince William of Wales is featured on the reverse of the coin. With Prince William reaching his 'coming of age', the Perth Mint was commissioned to strike a special commemorative coin in honour of the young Prince's 21st birthday, crafted in superb colour! As the eldest son of Prince Charles and the late Princess Diana, William has become one of the most popular Royals in the world. Good looks and a radiant smile, inherited from his mother Diana, have made him immensely popular with female's young and old.