ATTICA, Athens. Circa 454-404 BC. (AR Tetradrachm 17.18g  24.5mm  1h) OBV.  Head of Athena right, wearing earring, necklace, and crested Attic helmet decorated with three olive leaves over visor and a spiral palmette on the bowl. 
RV.  Owl standing right, head facing; olive sprig and crescent to left, AΘE to right; all within incuse square. 
Kroll 8       HGC 4, 1597       SNG Copenhagen 

      "Athens throughout most of the 5th Century BC., after the Persian defeat and withdrawal in 479, Athens was mistress of the Aegean world and became a great cultural, as well as political center. The long drawn-out Peloponnesian War, 431-404 BC.. drained Athens of her wealth and ended with the capture of the city by the Spartans. Although prosperous again in the 4th Century, Athens never fully regained her importance in international affairs, and in Hellenistic times became dependent first on Macedon, then Rome."  David Sear