Alexander III, AR drachm, Uncertain mint in Asia Minor, posthumous issue. Ca. 320-310 BC. 17.5 mm, 4.4 g. 

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

Omega on M monogram in left field, A beneath throne.

Price ML32; Mueller 32 ("Lysimachos") citing Sestini Hedervar 39 corr. ("type error").

Contributed by Dana J. Sept. 2022.
Confirmed as authentic by a reputable coin dealer. Purchased in Turkey in the 1950s.

Note: This monogram is in Price (449A) only on a tetradrachm from Amphipolis, with this monogram beneath the throne and Lambda over a torch in the left field.