Gallienus, AR Antoninianus, 258-259, Joint Reign, Lugdunum (RIC) Cologne GALLIENVS . P . F . AVG Radiate, cuirassed bust right DEO M_ARTI Mars standing facing, helmeted head left, reversed spear in left hand, right hand resting on shield set on ground, all in tetrastyle temple with empty pediment 19mm x 23mm, 3.62g