Watch List notes:

BRITISH COINS, George III, Silver Restrike Proof Farthing, 1799, laureate and draped bust right, tiny dot on shoulder on raised line, date below, GEORGIUS III DEI GRATIA REX, toothed border both sides, rev inverted die axis, Britannia seated left on rocks with shield, trident and olive branch, ship to left, waves below, BRITANNIA above, 1. FARTHING. below, edge plain, 7.18g (Peck 1283 R87; S 3779). Mint state, toned and extremely rare.
ex John G Murdoch Collection, first portion, Sotheby's, 31 March 1903, lot 314 (part), where the lot of six coins was bought by A H Baldwin & Sons Ltd for £2
with original ticket in hand of A H Baldwin, priced at 8/6d
ex Gregory Collection (part II), Baldwin's Auction 47, 25 September 2006, lot 550

Estimate: £2500-3000