The Great British Treasure Hunt Silver Proof The Penny Drops 2026 £5 1oz coin is a stunning coin celebrating a British treasure hunt with a unique design. Minted in 2026 during the reign of King Charles III, this coin has a fineness of 0.925 and is sourced from Great Britain. The £5 denomination makes it a valuable addition to any numismatic collection, showcasing the craftsmanship and heritage of the United Kingdom.