Pergamum, Mysia, AR Cistophoric tetradrachm. 166-67 BC.. 25 mm, 12.62 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 BO above, serpent-entwined thyrsos in right field.

Kleiner Pergamum 10; Pinder 94; SNG France 1718; SNG von Aulock 7467.

With permission of cngcoins.com, Jan. 2016
Estimate: $400.