Antiochos I AR tetradrachm, Seleukid Kingdom, Pergamon mint under Philetairos, struck in the name of Seleukos I, sole reign 281-280 BC. 30 mm, 16.86 g.

Head of Herakles right, wearing lionskin headdress.
BASILEWS SELEYKOY, Zeus seated left, holding eagle and sceptre.
Helmeted head of Athena right in left field, oval beneath the seat. 

SC 308d; Houghton 634 (this coin); Newell WSM 1535; SNG Spaer 244; Meydancikkale 2865.

With permission of CNG Triton IX, Lot 1015, Jan 2006.