Antiochos I Soter, Seleukid Kings of Syria. AE19, 281-261 BC. 
18.8mm, 6.11gr. Tarsos mint. 

Helmeted head of Athena right.
BASILEWS ANTIOCOU above and beneath caps of the Dioskuri; monogram in exergue. 

SNG Spaer 226; SC 332; Hoover 146

Sold on ebay by Frascatius Ancients, Nov. 2011.