Leonard Wyon (1826-1891), as modeller and engraver to the Royal Mint, dominated coin and medal production in Britain throughout much of the second half of the nineteenth century. His commisions included the famous 'bun' penny of Queen Victoria, coins destined for India, Australia and Canada, campaign and private medals as well as the prize medal for the 1862 International Exhibition. Primarily aimed at numismatists, this diary throws light on some of his most famous designs and places Wyon in the context of his times with details of his family life, his wealth and status, his religious and moral beliefs and his tastes in reading and the arts. Appendices trace the commissioning and production processes of his work. The diary entries are annotated and the text is illustrated with photographs of his many designs.