IMP
GALLIENVS AVG GERM (Translation: Imperator Gallienus Augustus Germanicus. Supreme commander (Imperator), Gallienus, emperor (Augustus), conqueror of the Germans.)
Reverse description
Mars, walking right, holding spear in right hand and trophy in left hand.
Reverse script
Latin
Reverse lettering
VIRTVS
AVGG (Translation: Virtus Augustorum. Courage of the emperors (Augusti).)