Watch List notes:

British Coins, George III, proof farthing, 1806, plain edge, struck in gold, laur. and dr. bust r., rev. Britannia std. l., holding trident and olive branch (S.3782; W&R.175; P.1392), certified and graded by NGC as Proof 61, extremely rare
Believed to be from descendants of the Boulton family, and the last one we can trace is the Pitman specimen from 1999 offered for sale
For an Irish example struck in gold, please see lot 1393
(6000-8000 GBP)