Tacitus. AE Antoninianus. 4.20g; 22mm. Siscia. 

IMP CM CLA TACITVS AVG, radiate, draped, cuirassed bust right

FELICITAS SAECVLI, Felicitas standing left by altar, holding 
patera and caduceus. 

Mintmark XXIV. 

Estiot 2293, La Venera 1760; RIC V (1) 184 var.

With permission of Roma Numismatics, November, 2009