The Sherlock Holmes 50p coin is not yet in circulation, so can't be found in change, but should soon be available to buy as a Brilliant Uncirculated coin in a presentation folder from The Royal Mint.
The obverse of the new Sherlock Holmes 50p coin released in January 2019 as part of The Royal Mint's Annual Coin Set will show the fifrh portrait of the Queen by Jody Clark and the inscription "ELIZABETH II · DEI · GRA · REG · FID · DEF".
The reverse will show a silhouette of Sherlock Holmes surrounded by titles of the books and the inscription "SHERLOCK HOLMES" and "50 PENCE" as per the proclamation by the Queen published in The Edinburgh Gazette dated 29 June 2018 DETERMINING THE SPECIFICATIONS AND DESIGNS FOR A NEW SERIES OF FIFTY PENCE COINS IN GOLD, STANDARD SILVER, SILVER PIEDFORT AND CUPRO-NICKEL
Once this coin is released in the Annual Set, Coin Hunter will have 100 of this coin to buy as an individual BU 50p coin. This will be available from the second week in January from the Coin Hunter Shop or from the Coin Hunt eBay Shop: Sherlock Holmes 50p BU Coin.
A 50p coin created for UK circulation by The Royal Mint will always be worth at least 50p. The coin can be in pretty much any condition and a shop will accept it as face value payment.
When a coin is considered collectable by a large number of people, even if the coin was struck to be used in circulation - it's value to a collector will rise to more than face value. In 2009 a coin was struck to celebrate the 250th anniversary of Kew Gardens, with a low mintage of 210,000 coins for circulation, the Kew Gardens 50p now sells for about 140 times face value.
The 2019 Sherlock Holmes 50p does not yet exist, but when first released it will likely be sold as a presentation folder in Brilliant Uncirculated quality for £10.
Coin values given are based on recent sold prices as at the page updated date shown at the bottom of this page. To view the likely selling price on eBay today, use the Coin Hunter eBay sold price checker.