Alexander III AR tetradrachm, posthumous issue, struck under Seleukos I Nikator. Babylon I mint. ca 311-300 BC. 

Head of Herakles wearing lionskin headdress.
BASILEWS ALEXANDROY, Zeus seated left, right leg drawn back, holding eagle and sceptre.

MI in left field; MYTR monogram (with dot in the Ρ) in wreath beneath chair. 

Price 3752; Mueller 735; Houghton SC 82.4b.

With permission of Roma Numismatics Ltd - E-Sale 87, Lot 431, July 2021.