ATTICA, Athens. Circa 454-404 BC. AR Tetradrachm (23.5mm, 17.15 g, 8h). Helmeted head of Athena right, with frontal eye / Owl standing right, head facing, closed tail feathers; olive sprig and crescent to left; all within incuse square. Kroll 8; HGC 4, 1597. High relief.