mgcoins database 
Mysia - Pergamon 200-0 BC AE AE21 8.19 g 2.11 cm 2.09 cm 1h
obverse: hd Asklepios r [ΣEΛEYKOY]
reverse: eagle l on thunderbolt, hd r Π-EP Γ-A MHNΩN
Sear GCV 2 3976
Munthandel G. Henzen list 208 (2010) 168.
Another example
Sale: CNG 61, Lot: 260. Closing Date: Sep 25, 2002. MYSIA, Pergamon. BID Estimate $100
MYSIA, Pergamon. Circa 200-133 BC. 20mm (8.22 gm).
Head of Asklepios right / Eagle standing on thunderbolt.
SNG Copenhagen 379. VF, dark green-brown patina. ($100)
From the David Freedman Collection.
Because of the obverse ΣEΛEYKOY (Seleukos) the coin may be dated earlier.
| The Pergamene Kingdom client state | | of the Seleucid Empire |
| 280-263 BC | Philetairos | 305-281 BC Seleukos I |
| | 281-261 BC Antiochus I |
| 262 The Pergamene Kingdom independent |
| 263-241 BC | Eumenes I |
| 241-197 BC | Attalos I, Soter |
| 197-160 BC | Eumenes II |
| 160-138 BC | Attalos II |
| 138-133 BC | Attalos III |
| 133 BC | Pergamon capital of
the Roman province of Asia |
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