Pergamum, Mysia, AR cistophoric tetradrachm, circa 76 BC. 

Obv: Cista mystica with half-open lid, from which serpent 
emerges; around, wreath composed of ivy and berries. 
Rev: Decorated gorytos (bowcase) between two serpents, their 
tails tied up; on left the city monogram PER, on right 
a serpent-entwined thyrsus. PRY and MOS monogram above.

SNG von Aulock 7481; BMC 118 var (PRY not in wreath); cf Sear 3945

Courtesy of TimeLine Originals (www.time-lines.co.uk), Jan. 2011