Attica, Athens. Ca. 454-404 B.C. AR tetradrachm (21 mm, 17.20 g, 6 h). Helmeted head of Athena right, with frontal eye / ΑΘΕ, owl standing right, head facing; above and behind, olive sprig and crescent; all within incuse square. Kroll 8; SNG Copenhagen 31. Minty luster. NGC Ch AU, strike: 2/5, surface: 4/5.