Watch List notes:

The Roman Empire
Tacitus, 275 – 276

Antoninianus, Lugdunum 275, AR 4.29 g. IMP C CL TACITVS AVG Radiate, draped and cuirassed bust r. Rev. VIRTVS AVG Soldier standing l., resting r. hand on shield and holding spear in r. C 172. RIC 69. CBN 1434. Good extremely fine

Illustrated on www.romancoins.info, section imagines imperatorum.
Here we have Tacitus sporting a rather sparse, thin beard, other portraits of his show a much longer and fuller beard. AMP.