Watch List notes:

The Portland Collection, British Coins, Charles II, threepences (2): 1674; 1678, laur., and dr. bust r., rev. crowned interlinked Cs denoting value (S.3386), both certified and graded by NGC, the first as Mint State 62, the second as Mint State 63 (2)
Erroneously attributed by NGC to the Bridgewater House Collection