Watch List notes:

Attica, Athens. Tetradrachm after 449 BC, AR 16.70 g. Head of Athena r., wearing Attic helmet decorated with olive leaves and palmette. Rev. Owl standing r.; in l. field, olive sprig and crescent. All within incuse square. Svoronos pl. XIV. Dewing 1591.
Light iridescent tone, metal somehow porous on obverse, otherwise good extremely fine