Kingdom of Macedonia, Demetrios I Poliorketes AR Tetradrachm. 
ca 298–295 BC. 

Obv: Nike alighting left on prow of galley, blowing trumpet held in her right hand, holding stylis in her left. 
Rev: BASILEWS DHMHTRIOY to right and beneath Poseidon, naked 
but for chlamys draped over his left arm, advancing left, 
brandishing trident. Tripod altar to left, XR monogram in left 
field, HR in lower centre. 

Mionnet I, 833; cf Sear 6762 (field marks).

Courtesy of TimeLine Auctions (www.timelineauctions.com), October, 2012.