Watch List notes:

BRITISH COINS. Other Properties. Isle of Man. George III, Proof Brass Halfpenny, 1798, Soho mint, second issue, small draped bust right, legend incuse with date below on raised rim, rev inverted die axis, triskelis, legend surrounding incuse on raised rim, plain edge (cf Pr 32B; M 73; S 7416c). Small dig in obverse field, uneven tone, good extremely fine and extremely rare.

Estimate: £500-600