Athens AR Tetradrachm, c. 430s BC

Athens , Attica. AR Tetradrachm (23-24 mm, 15.07 g), circa 430s BC.
Obv. Head of Athena to right, wearing disc earring, pearl necklace and a crested Attic helmet adorned with three olive leaves and a spiral palmette.
Rev. ΑΘΕ, Owl standing to right, head facing the viewer; to left, olive sprig and crescent moon; all within incuse square.
Agora 8a-8b; Svoronos, Trésor pls. 12-13 passim.

Countermarks on either side. About very fine/fine.