The specification of the coins is as follows: Sherlock Holmes 50p Brilliant Uncirculated Coin The commemorative 50p coins were made available in Gold proof, Silver Proof, Silver Proof Piedfort and Brilliant Uncirculated versions, whilst 8,602,000 coins were put into circulation. The drama was based on Sir Arthur Conan Doyle's detective stories and starred Benedict Cumberbatch as Sherlock Holmes and Martin Freeman as Doctor John Watson. The BBC TV show Sherlock ran from 2010 to 2017 and was hugely popular. How much are the Beatrix Potter 50p coins worth?.Buy the 'Collect Modern Coin' souvenir guide.Find the latest 50p coins in the Royal Mint shop! (opens in new window).The first story involving the character of Sherlock Holmes was published in 1887, and since then Holmes has inspired countless films, video games, radio plays and TV series. The Royal Mint issued a special Sherlock Holmes 50p in May 2019, to celebrate the 160th anniversary of author Sir Arthur Conan Doyle’s birth. Discover more about the Sherlock Holmes 50p coin