KINGS of MACEDON. Demetrios I Poliorketes. 306-283 BC. AR Tetradrachm (26mm, 16.63 g, 12h). Chalkis mint. Diademed and horned head right / Poseidon Pelagaios standing left, placing right foot on rock, holding trident; monogram to outer left. Newell 149. VF, toned, reverse fields smoothed down.