AR25 - Nero ΝΕΟ ΑΓΑΘ ΔΑΙΜ, L Δ

Year 4 of Nero's reign in Egypt — L Δ — places this tetradrachm in the early, relatively stable phase of his rule, before the Pisonian conspiracy of 65 AD forced a paranoid reorientation of imperial coinage policy. The Alexandrian mint operated under tight prefectural control, and its billon tetradrachms functioned as a closed currency system: Roman silver was formally prohibited from circulating in Egypt, making these provincial issues the de facto monetary instrument for the entire province.

The ΝΕΟ ΑΓΑΘ ΔΑΙΜ reverse — the Agathos Daimon serpent — is specific to early Neronian Alexandrian issues and draws on deep Egyptian numismatic tradition predating Roman rule entirely.