Gallienus. Billon antoninianus, Rome, 253-260 AD. Joint reign.

IMP GALLIENVS AVG GM, Radiate, cuirassed bust right. 
PAX AVGG, Pax standing left, holding branch and transverse sceptre. 

T in left field.
RSC 757, RIC 156 var (obv. legend)

With permission of Imperator Coins & Antiquities on vcoins.