Cayman Islands
Elizabeth II Sterling Silver Set 1980-CHI, Valcambi mint, KM48-57 variety, PR68 and PR67 Ultra Cameo NGC. Complete set of Sterling Silver Proof 25 Dollar coins issued in 1980 that commemorate the "Kings and Queens of England." Each coin features a house of English Kings beginning in 1042 with the Saxon Kings and ending with The House of Windsor in 1952. Interestingly, these commemorative coins were minted in .500 silver. What makes this set so incredibly rare is that it is one of only two sets struck in Sterling Silver.
Estimate: 2000-4000 USD