Constantine I, AE follis, Siscia.

IMP CONSTANT-INVS AVG, cuirassed bust left, wearing high-crested
helmet decorated with a chi-rho, holding spear and shield.
VICTORIAE LAETAE PRINC PERP, two Victories holding shield inscribed 
VOT PR over altar. Altar type Helvetica 6e (the letter I)
Mintmark dot BSIS dot.

RIC VII Siscia pre 81 var (obv legend)
Unpublished var. 

Contributed by Mark Dunning, March 2013.