Watch List notes:

British Coins, George III, pattern sixpence, 1787, with semée of hearts, edge plain, by Pingo, laur. and dr. bust r, rev. cruciform shields, crowns in angles (cf. S.3749; ESC.1640; Bull 2212), attractively toned, about mint state, rare
Proof issue with semée of hearts in Hanoverian shield not listed in the Standard Catalogue. Bull states only 168 pieces struck.
(600-650 GBP)