Gratian AE2. 378-383 AD. 

DN GRATIA-NVS PF AVG, helmeted, pearl diademed, draped, cuirassed bust right
GLORIA RO-MANORVM, Emperor standing left, head right, on galley, raising right hand, Victory seated at helm, wreath in left field, SMK Gamma in ex.

RIC IX Cyzicus 14a

With permission of Roma Numismatics