Watch List notes:

Tristan da Cunha Double Sovereign 2018 Armistice Centenary Remembrance Gold Proof with Ruthenium plating (Remembrance Gold), the Reverse design a Distinguished Conduct Medal highlighted in gold on the Ruthenium plated Gold background, a most unusual piece FDC in the Hatton's of London box of issue with certificate, only 299 pieces minted

Estimate: 600-800 GBP