Gratian AE2. 

Obv: DN GRATIA-NVS PF AVG, helmeted, pearl-diademed, draped and cuirassed bust 
 right holding spear and shield 
Rev: GLORIA RO-MANORVM, emperor standing left on prow of galley, holding 
 labarum, Victory seated at the helm. 

Mintmark ANT(officina letter), wreath in left field. 

RIC IX Antioch 40a, rated scarce

courtesy of dirtyoldcoins.com 2004.