Watch List notes:

Attica, Tetradrachm, Athens, After 449 BC, Ag (g 16,92; mm 24; h 8), Head of Athena r., wearing Attic helmet decorated with three olive-leaves and a palmettae, Rv. AΘE, Owl standing r.; behind olive spring and crescent. All within incuse square. SNG Copenhagen 31 ss.
Lustrous, minor porosity, all entire crest visible. Extremely fine.