Watch List notes:

Five Hundred Pounds 2017 Britannia Gold 5oz. .999 Gold Proof, Reverse: A modern interpretation of Britannia in a design by Louis Tamlyn, the reverse with a trident mintmark denoting the 30th Anniversary of the first Britannia Coinage. S.BR4, FDC in the Royal Mint box of issue with certificate and booklet, number 085 of just 130 pieces issued, with only 125 in this format

Estimate: 7200-7800 GBP