George III. AE proof farthing, 1799. Soho Mint, Third issue. 

GEORGIUS III DEI GRATIA REX, laureate, draped bust right, date 1799 below.
BRITANNIA, 1 FARTHING above and beneath Britannia sitting left, holding branch and trident, shield at her side. Ship sailing in background left.

Seaby 3779

Courtesy Ira & Larry Goldberg Auctioneers, Beverly Hills, CA. www.goldbergcoins.com
Sale 31: The Pre-Long Beach Auction May 30 - June 1, 2005, Lot 2503