Nicely preserved pergamon cystophore.
The obverse is slightly off-centered, but fully legible.
Greece
Mysia, Pergamon, Cistophoric Tetradrachm circa 85-76 BC
Obverse: serpent emerging from cista mystica, the whole within wreath
Reverse: two snakes coiled around a bow case, between the snake heads, MH above monogram of ΠPY, to left, monogram of ΠΕΡΓ, to right, serpent-entwined staff
Diameter 27 mm, weight 12.37 g