Gallienus, AE antoninianus. Rome. Sole reign. AD 261-262. 

GALLIENVS AVG, radiate, cuirassed bust right.
IOVI CONS AVG, Goat standing left. Mintmark digamma. 

RIC V-1, Rome 207; Goebl 0730k; Sear 10235. 

Image from the Dalheim hoard catalog.