Watch List notes:

CONSTANTINE I, (A.D. 307-337), AE follis, issued 312-313, London mint, (4.55 g), obv. Constantine laureate cuirassed bust right, around CONSTANTINVS P AVG, rev. around MARTI CON SERVATORI, * in left field, PLN in exergue, Mars standing to right with spear and shield, (S.15977, RIC 258). Extremely fine or better, rare.