billon Antoninianus (23mm 5.32gm ) Struck 275-276 A.D.
Mint of Cyzicus

Obv; IMP C M CL TACITVS AVG Radiate, draped, and cuirassed bust right

Rev; SPES PVBLICA Victory, holding palm, presents wreath to Tacitus standing on right facing to the left and holding scepter. V in exergue     

RIC Vi 207