Constantine I. A.D. 307/10-337. AE follis (22.5 mm, 3.28 g, 7 h). Rome mint, struck A.D. 313. IMP CONSTANTINVS P F AVG, laureate and cuirassed bust right / MARTI CONSERVATORI, Mars standing right, holding spear and shield; R-F/RS in exergue. RIC 6. aVF, sandy red patina. Rare.