Nicely preserved pergamon cystophore.
The obverse is slightly off-centered, but fully legible.
Greece
Mysia, Pergamon, Cistophoric Tetradrachm circa 76-67 BC
Obverse: serpent emerging from cista mystica, the whole within wreath
Reverse: two serpents standing by decorated bow case, MH and ΠPY monogram above with, monogram of ΠΕΡ to left, staff of Asklepios to right
Diameter 26 mm, weight 12.17 g