ATTICA, Athens. Circa 454-404 BC. AR Tetradrachm (23mm, 16.87 g, 1h). Helmeted head of Athena right / Owl standing right, head facing; olive sprig and crescent behind; all within incuse square. Kroll 8; HGC 4, 1597. Slight die shift on reverse. EF. Well centered and in high relief for series.