Watch List notes:

The Portland Collection, British Coins, Charles II, Maundy set, undated, crowned bust l., mark of value behind, rev. shield of arms over cross fourchée (S.3391), all certified and graded by NGC, the fourpence as Mint State 62, the threepence as Mint State 61, the twopence as Mint State 63, the penny as Uncirculated Details, Mount Removed, the penny with some striking weakness in the centre of the reverse (4)
*ex Bridgewater House, Sotheby's (15/16 June 1972), lot 360 (part).
Although NGC has described the penny as 'Mount Removed' the cataloguers can see no evidence of a mount.