Attica, Athens, AR Tetradrachm,(Silver, 16.48 g 24mm), Circa 454-404 BC.
Obv: Helmeted head of Athena right, with frontal eye.
Rev: AΘE, Owl standing right, head facing; olive sprig and crescent to left; all within incuse square.
Ref: Kroll 8; HGC 4, 1597.