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, the only issue of this denomination, a superb issue showing the full beauty of this unusual reverse design. FDC in the Royal Mint box of issue with certificate and booklet, Number 04 of only 21 pieces minted

Estimate: 42000-48000 GBP