Watch List notes:

St. Helena and Ascension Islands Fifty Pence 1984 Prince Andrew Royal Visit a 2-coin set both coins Fifty Pence Silver Proof Piedforts, one from each country an unusual set, the Ascension coin unlisted, nFDC-FDC in the red case of issue with certificate, the certificate lists 500 such sets minted

Estimate: 40-60 GBP