Attica, Athens. AR Tetradrachm, c. 454-404 BC. Helmeted head of Athena right, with frontal eye. Obv: R/ AΘE. Owl standing right, head facing; olive sprig and crescent to left; all within incuse square. Kroll 8. HGC 4, 1597. SNG Cop. 31. Gulbenkian 519-21. 17,23 g. 24 mm.