Tacitus AV Aureus. Siscia. 

IMP CM CL TACITVS AVG, radiate, cuirassed bust right, seen from
the back.
VIRTVS MILITVM, emperor galloping right or left, branishing
spear.

RIC V (1) 179; Calico 4122; Sear 11744. 

With kind permission of Numismatica Ars Classica, 2005.