Helena / SECVRITAS REIPVLICAE

Helena, mother of Constantine I, died 330 AD
AE 3 [19 mm, 3.00 g, 12 h], Cyzicus
Obv: FL HELENA AVGVSTA; Diademed and draped bust of Helena right
Rev: SECVRITAS REIPVLICAE; Helena standing left, holding branch. SMKB mintmark