This coin is the same as RIC 61 except for the dot in front of the mintmark. There are quite a few of these known.
Constantine I
A.D. 319
20mm 3.0gm
IMP CONSTANT-INVS AVG -- high crested helmet, cuir., spear across r. shoulder, shield with horseman on left arm
VICTORIAE LAETAE PRINC PERP -- two Victories stg., facing one another, together holding shield [wreath] inscribed VOT PR on altar.
in ex. •BSIS•
cf. RIC VII Siscia 61
