Roman Imperial
Tacitus (275-276 AD) Serdica
AE Antoninianus (22.6mm, 3.6g))
Obv: IMP C M CL TACUTVS AVG. Radiate bust left, with slight drapery.
Rev: CONSERVAT MILIT / A / KA. Mars, holding spear, standing right and presenting globus to Tacitus, holding sceptre and standing left.
RIC 3896.