Watch List notes:

BRITISH COINS. Other Properties. Isle of Man. Victoria, Pattern Copper Halfpenny, 1860, young head left, date below, rev struck en médaille, triskelis with armoured legs, QVOCVNQVE. IECERIS. STABIT., toothed border and raised rim surrounding both sides (Pr 36; M 95; S 7418c). Plenty of lustre, practically as struck and extremely rare.
only about 10-12 examples thought to have been struck

Estimate: £3000-4000