This coin has a workshop not listed in RIC. Not really that rare, as I have had a few others from workshop B; but this is a really nice example.
Constantine I
A.D. 319
20mm 3.3gm
IMP CONSTANT-INVS AVG; high crested helmet, cuir., spear across r. shoulder, shield on left arm
VICT• LAETAE PRINC PERP; two Victories stg., facing one another, together holding shield inscribed VOT PR on altar inscribed with I.
In ex. •BSIS•
RIC VII Siscia 82