Æ34 - Antoninus Pius L ΙΖ

Year 17 of Antoninus Pius's reign, which is what the "L ΙΖ" regnal date indicates — Alexandrian bronzes were dated by the Egyptian calendar year, a practice unique among provincial mints and invaluable to modern chronologists. The Alexandria mint was the sole authorized producer of coinage for Roman Egypt, a deliberate policy that isolated the province's money supply from the rest of the empire; Egyptian coins could not legally circulate outside Egypt, and foreign coins brought in had to be exchanged at the city's state-run trapezai.

Antoninus Pius never visited Egypt. He never left Italy at all during his 23-year reign.