Constantine I, as Caesar, 306-309. Half Follis (Silvered bronze, 20 mm, 4.59 g, 6 h), Treveri, circa summer 307. FL VAL CONSTANTINVS N C Laureate and cuirassed bust of Constantine I to right. Rev. MARTI PATRI CONSERV / S - A / PTR Mars standing front, head to right, holding inverted spear in his right hand and placing his left on shield set on ground. RIC 740. Extremely rare. A very attractive example with some traces of silvering. Good very fine.