Watch List notes:

Constantine I. AE 3, Reduced Follis; Constantine I; 307-337 AD, Ticinum, 313-4 AD, Reduced Follis, 3.92g. RIC-12, officina T=3 (r5). Obv: IMP CONSTANTINVS P F AVG Bust laureate, cuirassed r., seen from front. Rx: MARTI CON - SERVATORI Mars standing r. holding spear and shiels, star in l. field, TT in exergue. Rare reverse type, very rare officina: only one specimen from officina 3, in Vienna, known to Bruun in 1966. MS