George III AV Pattern 2 Guineas, 1773, by Tanner. 

GEORGIVS III DEI GRATIA, laureate fourth head right.
M B F ET H REX F D B ET L D SRIAT ET E, crowned coat of arms.

Seaby 3724A. WR-80. KM-PN51. 
extremely rare

Courtesy Ira & Larry Goldberg Auctioneers, Beverly Hills, CA. www.goldbergcoins.com
Sale 31: The Pre-Long Beach Auction May 30 - June 1, 2005, Lot 2393
SE3724A