KM-Unl. Mintage: 1. Another of these simply fascinating and unique Trial issues struck by the Royal Mint and distributed to the public through auction, commemorating Elizabeth's Platinum Jubilee while utilizing the imagery of her 1953 coronation Crown. Seemingly, the majority of Trials released to the public are struck in gold, yet here we have the unusual opportunity to offer our first instance of a platinum issue and as such, is worthy of the finest collections in the world with the known rapidly increasing in demand and ever expanding market for British rarities. Sold with the original case of issue and COA #01. Unique.