Watch List notes:

The Portland Collection, British Coins, William and Mary, threepence, 1690, conjoined busts r., rev. crowned mark of value (S.3442); Anne, threepence, 1704, dr. bust l., rev. crowned mark of value (S.3596), both certified and graded by NGC, the first as About Uncirculated 55, the second as Mint State 64 (2)
Erroneously attributed by NGC to the Bridgewater House Collection.