Pergamum Kingdom. Philetaerus. 282-263 BC. Tetradrachm, 16.90g (12h). Obv: Laureate head of Seleucus I right. Rx: ΦΙΛΕΤΑΙΡΟΥ Athena enthroned left, extending right hand to shield before her, and holding transverse spear with left hand; ivy leaf above her right arm, bow in outer right field. Newell 15b. SNG Paris 1598. Bold portrait struck in high relief. VF
Philetaerus, entrusted with the stronghold of Pergamum by King Lysimachus of Thrace, switched to the side of Seleucus I of Syria in 282 AD, and continued to show that king's portrait on his coins after Seleucus was assassinated in 280. The Pergamum mint's high-quality portraiture makes these Pergamene portraits of Seleucus I even more desirable than his portraits on coins struck by Seleucid mints