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The Seleukid Kingdom: ANTICHOS I, Soter - Sole Reign, 280-261 B.C.
Silver Tetradrachm (29mm, 16.21 gm.) Seleucia on the Tigris: 280-261 B.C.
References: Sear 6866. BMC 4.9,10.
Diademed head right with  a middle aged portrait. 
BASILEWS ANTIOXOY, Apollo seated left on omphalos, nude but for slight drapery  on right thigh, holding arrow in right hand, left hand resting on bow, monograms  left and right.