Kyrene, Kyrenaika, AR tetradrachm, ca. 460 BC, 17.22g. 

Silphium plant.
KYRA to right of bearded head of Zeus Ammon right, with 
ram’s horn and diadem, all within a raised circle in 
an incuse circle.

BMC 42; Boston 1310; Benson Collection 785 (this coin).

With permission of Baldwins Ltd, the NY Sale 27, the Prospero Collection, lot 632.