Tacitus (AD 275-276).
Antoninianus
(AE, 22 mm, 4.58 g)
AD 276. Ticinum.

IMP C M CL TACITVS AVG Bust of Tacitus right, radiate, cuirassed and draped. / MARTI PACIF Mars in military dress walking left, holding olive branch in right hand, transverse spear and long oval shield in left hand; in exergue S.
RIC online 3408.
Nice dark toning with some remains of silvering. Good very fine.