Constantius II, AE3, Siscia.

DN CONSTAN-TIVS PF AVG, rosette-diademed, draped, cuirassed bust right.
FEL TEMP-REPARATIO, soldier standing right, spearing fallen
horseman who is wearing an Phrygian helmet, reaching backwards.

Mintmark: ASIS

RIC VIII Siscia 350 var (diadem type).
RIC does not list a rosette diademed bust for the xSIS series.
Another, with BSIS is also in my collection.

ex biggyg2.
From Dane's collection, Feb. 2011.