Gallienus AE As. Sole reign, Rome, AD 253-268. 23 mm, 7.23 g. 

IMP GALLIENVS PF AVG, laureate and cuirassed bust right.
PAX AVG, Pax standing left, holding branch and transverse sceptre. S-C across fields.

RIC 426; MIR 439c. 

With permission of Fritz Rudolf Künker GmbH auction 288, Lot 814, March 2017.