Watch List notes:

Eight Hundred Pounds Britannia 2017 30oz. .999 Gold Proof, 100mm diameter, with trident mintmark marking the 30th Anniversary of Britannia Gold, S.BS1, thus far the only issue of this unusual denomination, a superb issue showing the full beauty of this unusual reverse design. FDC in the large Royal Mint box of issue with certificate and booklet, Number 02 of only 21 pieces minted

Estimate: 43000-55000 GBP