Athens, New style tetradrachm, 30 mm, 16.68 g. 156-155 BC. Magistrates Mikion, Euryklei and Aristos. 

Obv: Helmeted head of Athena right. 
Rev: A-QE and magistrates's names MIK-IWN, EVR-VKLE and ARI-STO 
across fields, owl standing right on overturned amphora, head 
facing; A on amphora; the Dioskuri standing left, one holding a 
patera, both holding spears, in right field; SW in exergue.

Thompson 475a (same reverse die); de Luynes 2106; Svoronos pl. 55, 16 var (exergual letters).