Gallienus, AE antoninianus. Rome. Sole reign. 

GALLIENVS AVG, radiate head right.
CONSERVAT PIETAT, Emperor standing left, holding patera and 
sceptre, small figure kneeling right at foot.
Mintmark XII. 

RIC V-1, Rome 171A; Goebl 0648a; Sear 10192.
Scarce.

Image from the Dalheim hoard catalog.