Five incredibly rare and valuable British coinsChief commercial officer at the Royal Mint, Nicola Mitchell, said: “The Royal Mint is stepping into a new era of coin collecting. “The Great British Treasure Hunt coin is not just a beautiful collector’s item; it’s an interactive device with more than meets the eye. (Image: Casey Gutteridge/Royal Mint/PA Wire)The Royal Mint will release the levels in waves (check the Royal Mint website for dates and details), starting from January 29, with each update containing various tips and hints. These coins can be purchased from the Royal Mint website (a link to which can be found above) from 9am on Thursday (January 29). The coin will not be going into general circulation, the Royal Mint added.