Æ33 - Antoninus Pius L Δ

Year four of Antoninus Pius's reign — the regnal date marked by the L Δ — corresponds to 140/141 AD, the same period in which Antoninus was negotiating the construction of the Antonine Wall in Britain and consolidating frontier policy across the empire. Alexandria's civic bronze coinage operated on its own Egyptian calendar year system, independent of Roman mint authority, which is why Alexandrian issues carry explicit regnal year markers that coins from Rome itself never needed.