Watch List notes:

BRITISH TOKENS, 18th Century Tokens, Wales, Anglesey, Amlwch, Parys Mine Company, Silver Proof Penny, undated (1787), obv druid's head within a thin wreath, four acorns to left, six acorns to right, rev PMCo cypher, WE PROMISE TO PAY THE BEARER ON DEMAND ONE PENNY around, edge plain in collar (DH 2a). Extremely fine though lightly rubbed at the high points, darkly toned with traces of original colour, extremely rare.
ex Hamer collection, Glendining auction, 27 November 1930, lot 464

Estimate: £1000-1500