Gratian AE3, Siscia.

DN GRATIANVS PF AVG, pearl diademed, draped, cuirassed bust right.
GLORIA RO-MANORVM, Emperor in military dress, advancing right, 
head left, holding labarum, dragging captive behind him.
left field: S over dot.
right field: C over hooked A (SYM 4).
mintmark: Delta SISCA

RIC IX Siscia 14c, type xxxviii

Forvm Ancient Coins sale, 2002.