Probus AE Antoninianus. Siscia. AD 276-282. 22 mm, 4.78 g.

IMP PROBVS P F AVG. Radiate, helmeted and cuirassed bust left, holding spear over shoulder and shield. 
PAX AVGVSTI, Pax standing left, holding branch and transverse sceptre. 
V in right field, mintmark XXI. 

RIC 713. 

With permission of Numismatik Naumann auction 108, Lot 886, Oct 2021