Attica, Athens, AR tetradrachm (Silver, 23.3 mm, 17.23 g), ca. 454-404 BC.
Obv: Head of Athena right, wearing crested Attic helmet ornamented with three laurel leaves and vine scroll.
Rev: ΑΘΕ, owl standing right, head facing, olive sprig and crescent moon behind, all within incuse square.
Ref: SNG Münich 52; SNG Cop 32.