Year 19 of Antoninus Pius's reign corresponds to 155–156 AD, a period of exceptional administrative stability in Roman Egypt. Alexandria's mint operated under strict imperial oversight, and the regnal year dating system used on Alexandrian bronzes — unique among Roman provincial coinages — allows these pieces to be placed with a precision rarely possible for provincial issues of the period.
Year 19 of Antoninus Pius's reign corresponds to 155–156 AD, a period of exceptional administrative stability in Roman Egypt. Alexandria's mint operated under strict imperial oversight, and the regnal year dating system used on Alexandrian bronzes — unique among Roman provincial coinages — allows these pieces to be placed with a precision rarely possible for provincial issues of the period.