Constantine I, 307/310-337. Follis (Bronze, 20 mm, 3.41 g, 6 h), Rome, 313. IMP CONSTANTINVS P F AVG Laureate, draped and cuirassed bust of Constantine I to right. Rev. MARTI CON-SERVATORI / R - F / R Q Mars standing front, but slightly turned to left, head to right, holding inverted spear in his right hand and placing his left on shield set on the ground. RIC 10. Extremely rare. Minor flatness on the reverse, otherwise, good very fine.