Seleukid Empire. Antiochos I Soter. 281-261 BC. AR Tetradrachm 24.5mm, 16.65 g. Aļ Khanoum mint. Struck circa 271-266 BC. 

Diademed head right.
BASILEWS ANTIOXOY, Apollo Delphios, testing arrow and resting hand on grounded bow, seated left on omphalos.

Delta in circle in inner left field. 

Newell, ESM 705; SNG Spaer 327; SC 438.1a; SMAK A1TA-32 (this coin); Hoover HGC 128i.

With permission of cngcoins.com, auction 109, Lot 221, Sept. 2018.