Probus, AE antoninianus, Siscia. 3.5 g. 

IMP PROBVS P F AVG, radiate, helmeted, cuirassed bust left, holding spear over shoulder and shield on left arm.
PAX AVGVSTI, Pax standing left, holding olive branch and transverse sceptre. 

T in right field. Mintmark XXI. 

RIC 713. 

With permission of Numismatik Naumann auction 103, Lot 905, June 2021