Watch List notes:

British Coins, William IV, sovereign, 1831, WW without stops, first portrait, bare head r., rev. crowned shield of arms (S.3829A; Marsh 16 [R2 for the date]), certified and graded by PCGS as Mint State 64+
Certainly the finest known - the only example graded MS64+ by PCGS - and as such exceedingly rare.
(8000-10000 GBP)