Watch List notes:

George III (1760?1820), Proof Halfpenny, 1806, struck in gilt copper, small laureate and draped bust right, brooch with two broken jewels, date below, reverse struck en medaille, Britannia seated left on rocks, ship to left, edge grained (BMC 1366, KH38; S 3781). As struck, delightful. Encapsulated by NGC PF64+ Cameo.