Helena, mother of Constantine I (324-328/30). AE Follis, Thessalonica mint. D/ FL HELENA AVGVSTA. Diademed and draped bust riight. R/ SECVRITAS REIPVBLICE. Saecuritas standing left, holding branch; in exergue, SMTSΔ. RIC 159 (R3). AE. g. 3.54 mm. 19.00 RR. Very rare. Lovely glossy olive green patina. Gently smoothed, otherwise about EF.