Watch List notes:

William IV, proof halfcrown, 1831, bare head right, rev. crowned shield of arms on mantle, plain edge (S.3834A; ESC.2473), certified and graded by NGC as Proof-64 Cameo, a choice example of the piece issued in the coronation proof sets of 1831, mintage estimated at 300, this one having pleasing old grey toning

Estimate: 2500 - 3000 GBP