Probus, Antoninianus, billon, reign 276–282 CE, minted 276–282 CE

Probus, Antoninianus, billon, reign 276–282 CE, minted 276–282 CE, weight 4.1 g, diameter 23 mm. Obverse: radiate bust left, wearing imperial mantle, holding eagle-tipped sceptre; legend IMP C M AVR PROBVS P F AVG encircling. Reverse: Sol standing facing in spread quadriga, head left, holding whip; legend SOLI INVICTO in exergue with field marks CM and officina mark XXIV. Strike: well-centered strike on a rounded flan, minor die fatigue on bust high points. Toning: uniform light grey with darker peripheral silver-black patina. References: RIC V Probus 911, attributed to the Cyzicus mint. The antoninianus of Probus reflects the late third-century monetary system in which reduced-silver billon coinage circulated widely across the empire. Probus implemented rigorous military reforms and frontier defenses after the turmoil of the Crisis of the Third Century, and his coinage often celebrated victories and the protective deities of the army. The reverse type honoring Sol Invictus aligns with the contemporary imperial emphasis on the unconquered sun as a unifying celestial patron, a theme promoted by several emperors from Aurelian onward. The use of a quadriga underscores Sol’s status as a cosmic charioteer guiding the empire toward stability. Output from the Cyzicus mint illustrates the decentralization of imperial mints intended to ensure adequate pay for frontier troops and accelerate distribution of new issues across the eastern provinces.