Antiochos I AR tetradrachm, Seleukid Kingdom, Pergamon mint under Philetairos, struck in the name of Seleukos I, sole reign 281-280 BC. 30 mm, 16.90 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, crescent  beneath the seat. 

SC 308b; Newell WSM 1532; SNG Spaer 242.

With permission of Roma Numismatics Ltd - E-Sale 68, Lot 653, Feb 2020.