Pergamum, Mysia, AR Cistophoric tetradrachm. 166-67 BC. 20 mm, 12.5 g. 

Obv: Cista mystica, half-opened with a serpent emerging 
from it, surrounded by a wreath of ivy and vine leaves. 
Rev: Two serpents entwined around a bow in bowcase. PERG 
monogram to left, magistrate's initials NI above, serpent-entwined thyrsos in right field.

Kleiner Pergamum 23; Pinder 99; SNG France 1724.

With permission of Savoca Numismatics, Dec. 2015.
Estimate: 75 euros.