Tacitus, AE antoninianus. Serdica. 

IMP CM CL TACITVS AVG, radiate, draped, cuirassed bust right.
PROVIDEN DEOR, Providentia standing right, holding two standards, 
facing Sol, standing left, holding globe and raising right hand. 

Mintmark KA dot gamma. Paris 1787; RIC V-1 195 var (no star in field). 

CNG Sale 2006, www.cngcoins.com