Tacitus, silvered antoninianus, Cyzicus. AD 275-276. 

IMP CM CL TACITVS AVG, radiate, draped, cuirassed bust right.
CLEMENTIA TEMP, Mars standing right, holding spear, presenting
a globe to the emperor, standing left, holding sceptre.

Mintmark S. 

Estiot 2414, La Venera 1690
Scarce.

With permission of Auktionshaus H. D. Rauch, April 2015.