Watch List notes:

The Portland Collection, British Coins, George II, threepences (2): 1743; 1760, laur., dr. and cuir. bust l., rev. crowned mark of value (S.3713B), both certified and graded by NGC, the first as Mint State 64, the second as Mint State 63 (2)
Erroneously attributed by NGC to the Bridgewater House Collection.