Constantine I The Great (307-337) AE Follis (Bronze, 4.68g, 21mm) 311-312 Cyzicus.
Obv: IMP C FL VAL CONSTAN TINVS P F AVG, Head with laurel wreath right.
Rev: HERCVLI - VICTORI / Γ / MKV. Naked Hercules with lion skin leaning on club, standing to the right.
Ref: RIC VI, p. 592