Unlisted for the ruler, RIC lists this type only for Licinius and Maximinus.
Constantine I, AE follis; Nicomedia
Ox: IMP C FL VAL CONSTANTINVS P F AVG; laureate head right
Rx: VIRTVTI E-XERCITVS; Virtus advancing right in military dress, holding transverse spear, shield and trophy. Gamma in right field, Mintmark SMN
21mm, 5.0gms