Tacitus Antoninianus. 275-276 AD. 

Obv: IMP CM CL TACITVS AVG, radiate, draped & cuirassed bust right
Rev: SALVS AVG, Salus standing left by altar, holding sceptre & feeding serpent rising from altar. <font face="SYMBOL">D</font> in right field, XXI in ex. Rome mint. 

Not in RIC. Estiot 0152, La Venera 1856. Rare.

Contributed by Dane for Roma Numismatics