Watch List notes:

The Portland Collection, British Coins, William and Mary, threepences (2): 1691; 1694, conjoined busts r., rev. crowned mark of value (S.3442), both certified and graded by NGC, the first as Mint State 63+, the second as Mint State 64+ (2)
*ex Bridgewater House, Sotheby's (15/16 June 1972), lot 378 (part).