Probus AE Antoninianus. Siscia. 

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

Mintmark XXIS. 

Alföldi 33-6; Not in RIC. 
Scarce.