Herakles - PERDICCAS II. Crested Helmet. $49.00 Sep-19-02 Seller herakles_inc Kings of Macedon Perdiccas II 454-413 B.C. AR Tetrobol. 1.975 grams. Obverse: Horse pacing r. Reverse: Crested helmet r., in double linear square within shallow incuse. SNG Copenhagen 495 variety. Herakles Numismatics, Inc.