The 2015 Royal Mint Longest Reigning Monarch BU Fine Silver £20 Coin features a design of UK Britannia, minted by the British Royal Mint with a fineness of 0.999. This coin celebrates the longest reigning monarch in British history and is sealed in a protective case, making it a valuable addition to any coin collection or a meaningful gift for monarchist enthusiasts. With its high purity and iconic design, this £20 coin is a treasured piece that commemorates a significant moment in British history.