Tacitus AE Antoninianus. Lugdunum Mint. 

IMP CL TACITVS AVG, Radiate, draped,
and cuirassed bust right.
MARS VICTOR, Mars advancing right, holding spear and
trophy; 
Retrograde C in left field, star in r. field.

Emission 7, Officina 3. Minted May to June 276 A.D.
References RIC 30 Bust Type C. Cohen 57 (corr.). Bastien 103 (33)

Contributed by Martin Griffiths, April, 2004.