Watch List notes:

COINS, EUROPEAN TERRITORIES, ISLE OF MAN James Stanley, 10th Earl of Derby (1702-1736), Copper Proof Penny, 1733, Stanley crest, the eagle with child upon cap of maintenance, frosted cap, date below, rev Triune (cf Pr 13B; S 7408; KM 5). Lovely glossy uncirculated, unrecorded in copper, but see note to previous lot.
As these show up quite choice and can be difficult to discern between a proof and a well struck early strike, it is generally acknowledged that if the edge milling is full and intact, the piece is a proof.

Estimate: £250-350