Pergamum, Mysia. AR Cistophorus, 12.43 gr, 29.04 mm. 133-67 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; city monogram PER to left; AS above; serpent-
entwined thyrsus to right.

BMC 96; cf Sear 3945.