Constantine I (307-337). AE Follis, Trier mint, 310-313. Obv. IMP CONSTANTINVS AVG. Laureate and cuirassed bust right. Rev. MARTI CONSERVATORI. Bust of Mars, helmeted, cuirassed, right. RIC VI Treveri 881. 3.35 g. 21 mm. Gently smoothed. About EF.