Watch List notes:

Constantine I. A.D. 307/10-337. AE follis (26.91 mm, 6.06 g, 12 h). Trier mint, A.D. 307. FL VAL CONSTANTINVS N C, laureate, draped, and cuirassed bust right / MARTI PATRI CONSERVATORI, Mars, helmeted, naked, standing right, right hand leaning on reversed spear, left resting on shield set on ground; S//A in fields, PTR in exergue. RIC VI 729. 

From the Joseph Donzanti Collection; Ex Roma Numismatics.