Tacitus, AE antoninianus. Serdica. 

IMP C TACITVS INVICTVS PF 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 delta. 

RIC V-1 196, rated scarce.

With kind permission of Numismatik Lanz, Auction 2003
Sold for 600 DM.