Rare and desirable obverse legend with INV[ICTVS] = (Invincible) title, struck at Siscia only during the 2nd emmission.
Obverse: IMP PROBVS INV AVG
Radiate, cuirassed and draped bust right, seen from the back.
Reverse: FELICITAS AVG / B / XXI
Felicitas standing left, holding patera over altar and cornucopiae.
Bilon, diameter 20,6 mm, weight 3,97 g.
