Great Britain
George III Proof Sixpence 1787, S-3748, KM607.1, PR63 NGC. With no hearts in Hanoverian shield. Borders of squared teeth conclusively establishing this coin as a Proof. Attractively toned with some reflectivity present. The Proofs are listed with hearts and not without, but actually both varieties exist in Proof.
Estimate: 500-600 USD