Watch List notes:

Five Hundred Pounds 2015 Queen Elizabeth II - The Longest Reigning Monarch One Kilo of .999 Silver Proof S.R4, FDC in the large NGC holder and graded PF69 Ultra Cameo, the only Silver Kilo issue bearing the James Butler portrait of the Queen. In the Royal Mint box of issue with certificate and booklet. Number 26 of only 100 issued in the large slabbed format. Only 320 pieces were minted in total in all formats

Estimate: 800-1000 GBP