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.
Mintmark SMK delta.

RIC IX Cyzicus 14a.

Contributed by Online Store of the Forum Ancient Coins, Jan, 2013.