Semis - Nero TR POT P P S S C, Roma

Nero's semisses from this period were struck under the monetary reform he implemented in 64 AD, which reduced the weight standards of the gold and silver coinage — the aureus and denarius — for the first time since Augustus. The bronze denominations, including the semis, were effectively dragged into a system under strain, their continued production more a function of small-transaction necessity than imperial prestige.

RIC I 227 is a Rome mint issue, struck during the years bracketing the great fire of 64 AD and the subsequent Pisonian conspiracy of 65.