Gallienus, AV light aureus or AV quinarius. 1.28 g. Rome. Sole reign, AD 264-267. 

GALLIENVS AVG, laureate head right.
MARTI PACIFERO, Mars standing left, holding branch and 
resting left hand on shield, upright spear resting against
his left arm.

RIC V-1 (S), Rome 112; Cohen 616; Calicó 3550 (this
coin); Goebl 657b (this coin); Sear 10129.

With permission of Auktionshaus H. D. Rauch GmbH, May 2010.