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

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

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

Image from the Dalheim hoard catalog.