Constantine I (307-337).AE Follis, Siscia mint, 328-329 AD.Obv. CONSTANTINVS AVG. Laureate head right.Rev. PROVIDENTIAE AVGG. Camp gate with two turrets, no doors; above, star; in exergue, ΓSIS double crescent.RIC VII 214.AE.g. 2.42 mm. 18.50An outstanding example. Enchanting dark emerald green patina.EF.