Tacitus - FELICITAS SAECVLI unique? (MA2533)

No other examples with this combination, only one with IMP C M CL TACITVS  P AVG TACITUS (275-276).

Antoninianus. Siscia.

Obv: IMP C M CL TACITVS  AVG.

Radiate, draped and cuirassed bust right.

Rev: FELICITAS SAECVLI / XXI 

Felicitas standing left, holding caduceus and sacrificing from patera over altar. T in field.

RIC online 3696 var. legenda obverse

Condition: very fine.

Weight: 3.39 g.

Diameter: 23 mm.

 Tacitus. AD 275-276. Antoninianus (23mm, 3.52 g, ). Serdica mint, 1st officina. 1st emission, November-December AD 275. IMP C M CL TACITVS AVG, radiate, draped, and cuirassed bust right / CLEMENTIA TEMP, Mars standing left, holding olive branch and spear; shield at feet to right; S. RIC V -;