Watch List notes:

Twenty Pounds (10) 2013 George and the Dragon (2), 2014 Outbreak of the First World War (2) 2015 The Longest Reigning Monarch, 2015 Sir Winston Churchill (2), 2016 90th Birthday of Queen Elizabeth II, 2016 Welsh Dragon (2) each 15.71 grammes of .999 silver BU in the Royal Mint packs of issue

Estimate: 200-300 GBP