Probus - SECURITAS not in RIC (F1918)

Probus, 276-282. Antoninianus (Billon, 22 mm, 3.58 g), Siscia, 1st officina, 276-277. IMP C M AVR PROBVS AVG Radiate, draped and cuirassed bust of Probus to right. Rev. SECVRITAS SAECVLI /A/ XX Securitas seated left on throne, holding scepter and leaning head upon hand. RIC V 762 var. (obverse legend). Rare variation on the obverse legend and XX instead of XXI.