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