Pergamum.
C. Septimius T. f. Cistophoric tetradrachm, magistrate Poseidonios, 57-55, AR 27 mm, 11.95 g. Serpent emerging from cista mystica; all within ivy-wreath. Rev. Two serpents standing by decorated bow case; above, C•SEPTVMI•T•F PRO•COS; in l. field, monogram of Pergamum and in r., distaff of Asclepius. Below, ΠOCЄIΔ&NIOC. Stumpf 41.Rare. Good very fine

Ex Naville Numismatics sale 8, 2014, 108.