Probus AE Antoninianus. Lyons. 

IMP CM AVR PROBVS AVG, radiate, cuirassed bust right, 
holding spear over shoulder.
FIDES MILITVM, Fides standing left, holding two standards. 

Mintmark III. 

RIC V-2 Lyons 28 var (bust type); Appleshaw hoard 360; Bastien 230.
Scarce.