Tacitus AE Antoninianus, Ticinum (RIC) or Siscia (Estiot).

IMP CM CL TACITVS AVG, radiate, cuirassed bust right.
FELICITAS AVG, Felicitas standing left by altar, holding patera and caduceus.
Officina letter V below. 

RIC V (1) 135 var (officina)
Rare. 

With permission of H.D.Rauch Mail Bid Sale 11, Sept 2006, lot 
1156. sold for 46 Euro