In 1972 to celebrate the Silver Wedding Anniversary of Her Majesty Queen Elizabeth II and Prince Philip, the Royal Mint released a Limited Issue Silver Wedding 25p Twenty Five Pence Commemorative Proof Crown Coin.
The reverse designed by Arnold Machin has the initials EP and the wording Elizabeth and Philip 20 November 1947 - 1972.
The obverse depicts a portrait of Her Majesty Queen Elizabeth II by Arnold Machin.