Lysimachus, AV Tetradrachm, 30mm, 16.78 g. Byzantium mint. ca 297-281 BC. 

Diademed head of deified Alexander right, with horn of Ammon 
BASILEWS LUSIMACOU, Athena seated right, holding Nike in her 
extended right hand and left resting on shield, spear 
leaning against the chair back. 

AGO mon over ZS mon with crescent (Latin Z) in left field. 

Upper monogram var of Mueller 733 and Marinescu 16-19 (no O)

With permission of Numismatik Lanz, May 2004