Kingdom of Pergamon. Attalos I, 241-197 BC. AR Tetradrachm, 28mm, 16.28 g, struck ca. 241-197 BC. 

Laureate head of Philetaerus right.
FILETAIROY, Athena seated left on prow, holding wreath on extended right hand, transverse spear beside her, club in outer left field, EYMO monogram in inner left field, bow in right field. 

Westermark 123; Imhoof Dynast 38.

With permission of Bertolami Fine Arts E-Auction 49, Lot 465, Nov. 2017.