Antoninianus of Postumus, struck at Colonia Agrippinensis

This silver antoninianus of Postumus, struck at Colonia Agrippinensis between AD 260 and 269, weighs c. 3.8 g and measures about 23 mm. Obverse legend IMP C POSTVMVS P F AVG encloses a radiate, draped and cuirassed right-facing bust, indicating issuance at a double-denarius tariff. Reverse bears SAECVLI FELICITAS with Postumus laureate, standing right, holding globe and spear, proclaiming prosperity and military security. The coin is normally struck on a slightly debased silver flan with moderate centering; surviving specimens show light grey surfaces with peripheral darker toning. Standard reference: RIC V Postumus 325.

Issued during the breakaway Gallic Empire, this coin publicised Postumus's claim to protect the western provinces after Valerian's capture in 260. The combination of radiate portrait and felicitas legend promoted both military strength and general prosperity, reinforcing loyalty among Gallic legions and civilian elites while emphasising the legitimacy of a separate imperial regime.