"Mysia, Pergamon (?). L. Sempronius Atratinus. Quaestor, circa 42-39 B.C. AR cistophoric tetradrachm (25.9 mm, 12.01 g, 4 h). Cista mystica with serpent; all within ivy-wreath / Two serpents entwined around bow and bowcase; ATRA monogram above, Q to left, serpent-entwined thyrsos to right. SNG France 1766-1768; SNG Copenhagen 444-445; Pinder 203. aVF, toned. "