As of Nero (54-68 AD)

Description

Front head to the right, IMP(erator) NERO CAESAR AVG(gustus) P(ontifex) MAX(imus) TR(ibunicia) POT(estate) P(ater) P(atriae) IMP(erator

Reverse Victory to the left, holding a concave round shield inscribed S(enatus) P(opulus)Q(ue) R(omanus), in field S(enatus C(onsulto).

As, bronze, diameter 26 mm, struck 66 AD in Lyon (Lugdunum).