Watch List notes:

British Coins, William IV, pattern crown, 1831, bare head r., raised W. WYON on truncation, rev. crowned shield of arms over mantle, edge plain (S.3833; ESC.273; Bull 2460; L&S.3), certified and graded by PCGS as Proof 63
This is the scarcer of the two types and books at £45,000.
(25000-35000 GBP)