Billion Antoninianus (21mm, 3.58g) Struck A.D. somewhere between A.D. 260-268, Cologne

Obv: IMP C POSTVMVS P F AVG Radiate draped bust right

Rev: IOVI VICTORI Jupiter, nude, standing facing, head right, scepter in left hand over shoulder, hurling thunderbolt with right

RIC V ii 311