Royal Mint 2018 Silver Proof Two Pounds, RAF Centenary of the Sea King Royal Mint 2018 silver proof two pounds, RAF Centenary, Watchful and Vigilant, Sea King. This coin is FDC, housed in an official Royal Mint case with certificate. £55 ENQUIRY FORM To enquire about this Coin please use the form below Your Name* Your Email* Your Message How did you find us? Please selectPublicationWord of mouthSearch engineOther Human test: Which is bigger, 2 or 8?