Athens, Attica, New Style tetradrachm. AR30, 16.60 g. 186-147 BC. Period 3, series 38.

Obv: Helmeted head of Athena right.
Rev: Owl standing right on amphora, magistrate names DIO-
NOK, EPI-GENH, SWSAN-DROS to left and right; to left an
 eagle standing right on thunderbolt; delta on amphora, date 
SF below.
cf SNG Cop 230 (date); BMC-;

Courtesy of "Klassische Münzen" on ma-shops.com, March 2011.