Probus AE Antoninianus. Siscia, AD 280.

IMP C M AVR PROBVS AVG, radiate, draped, cuirassed bust right.
FELICITAS AVG, Felicitas standing left by altar, holding patera 
and caduceus. 

A in right field.
Mintmark XXI.

RIC V-ii, 675C, Sear 11971.