Watch List notes:

Ten Pounds 2015 Queen Elizabeth II The Longest Reigning Monarch 5oz. Silver Proof S.M6 The only Ten Pounds Silver issue to use the James Butler portrait, The Reverse with the Five different previously used Heads of Queen Elizabeth II, FDC in the Royal Mint box of issue with certificate and booklet, only 1000 pieces issued in this presentation format

Estimate: 150-200 GBP