||George III Proof Shilling 1820, KM666, S-3790, reeded edge, PR65 NGC. Rare. A lovely example with reflective surfaces, this coin is richly toned in shades of deep grayish mauve with blue and amber-gold iridescence. The reverse shield's tiny details are not fully struck up but all other features, including the high rims, are bold. One of the finest examples of this proof seen by the cataloguer in 35 years of involvement in English coins.
Realized $3,818.75. Description courtesy of Heritage Auctions.