Greece, Attica, Athens. Circa 475-465 BC. AR Tetradrachm (22mm, 8-14 grams weight). Transitional type. Head of Athena right, wearing crested Attic helmet decorated with three olive leaves over visor and a spiral palmette on the bowl / Owl standing right, head facing, with spread tail feathers; olive sprig and crescent behind; all within incuse square. Starr Group IV, 129-30 var. (O113/R- [unlisted obv. die]); SNG Copenhagen -; SNG München -; SNG Lockett 1837.