GREAT BRITAIN. 6 Pence, 1817. NGC PROOF-63.S-3791; KM-665. Plain edge. Impressively bold through the designs with high rims and watery reflectivity in the fields that confirm presentation quality. Old tone, comprised of a mixture of rich rainbow hues, contributes even more to the highly charming appearance. <strong>RARE</strong> and highly coveted in this Proof format.