Æ34 - Antoninus Pius L Δ

Year four of Antoninus Pius at Alexandria corresponds to the regnal year marked by the delta (Δ) in the dating formula — a Egyptian provincial convention that tied coin production to the emperor's accession count rather than the Roman consular calendar. The Alexandria mint was the sole authorized producer of coinage for Roman Egypt, a monopoly enforced so strictly that travelers entering the province were required to exchange their Roman silver for local issues, with the spread pocketed by the imperial treasury.