Watch List notes:

BRITISH COINS, William IV (1830-1837), Gold Proof Maundy Penny, 1831, bare head right, GULIELMUS IIII D: G: BRITANNIAR: REX F: D:, toothed border surrounding both sides, rev inverted die axis, crowned figure 1, date wither side, oak wreath surrounding, edge plain, 1.07g (Robinson 355; cf Bull 2549 (part); cf Davies 420 (part); cf ESC 2438 (part); cf S 3840). A little weakly struck on second half of obverse legend, light hairline scratch in obverse field in front of face, nick in reverse field, otherwise extremely fine, toned and extremely rare.
Purchased privately from Siegfried E Schwer in the 1990s

Estimate: £2500-3000