George III AV Proof Half Guinea, 1787. Spade type.

GEORGIVS III DEI GRATIA, laureate fifth head right.
(clockwise from lower left) M B F ET H REX F D B ET L D SRIAT ET E 1787, crowned (spade shaped) shield of the coat of arms of Britain.

Seaby 3735; WR-130. 

Courtesy Ira & Larry Goldberg Auctioneers, Beverly Hills, CA. www.goldbergcoins.com
SE3735