Constantine I (307-337).AE Follis, Ostia mint, 312-313 AD.Obv. IMP C CONSTANTINVS PF AVG. Laureate and cuirassed bust right.Rev. SPQR OPTIMO PRINCIPI. Legionary eagle between two vexilla; in exergue, MOSTP.RIC VI, 96.AE.g. 4.16 mm. 21.50R.Rare. From well detailed dies. Green-brown patina. Minor areas of flatness, otherwiseEF.