Circa 420-410 BC. AR tetradrachm, 17.2 gr., 25 mm.
Obv: head of Athena to the right, wearing Attic helmet decorated with olive leaves and palmette.
Rev: AΘE downward in right field; owl standing right; in left field: olive sprig and crescent. All within incuse square.
Ref: Svoronos pl. XIV.