Valerian I. Bi Antoninianus. AD 253-260. 18mm, 2.23 g. Rome mint. Struck AD 255. 

IMP CP LIC VALERIANVS PF AVG, radiate, draped and cuirassed bust right.
PM TR P III COS III PP, Emperor seated left on curule chair,
 holding globe and sceptre. 

RIC 142b; Goebl 55c; RSC 163.

Contributed by "Marsyas Mike" on the Coin Talk forum, Oct. 2017.