Constantine I (307-337) AE (Bronze, 3.47g, 23mm) Siscia, 313-315.
Obv: IMP CONSTANTINVS AVG, laureate head right
Rev: IOVI CONSERVATORI, Jupiter standing to left, holding victory and sceptre; eagle at feet to left, wreath in beak; Є in right field, SIS in exergue.
Ref: RIC 7.