Double weight 16grams Piedfort The 2010 Girl Guiding Anniversary 50p Coin in Silver Proof is a special edition coin issued to commemorate the 100th anniversary of Girl Guiding in Great Britain. Minted in 2010 during the reign of Queen Elizabeth II, this coin has a fineness of 0.925 and is made of silver sourced from the UK. This collectible coin is a symbol of the enduring legacy of the Girl Guides and is a valuable addition to any coin collection.