Watch List notes:

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. 18.50 An outstanding example. Enchanting dark emerald green patina. EF.