Æ32 - Antoninus Pius L ΚΒ

Year 22 of Antoninus Pius corresponds to 158–159 AD, placing this issue in the middle of one of the most administratively stable periods Roman Egypt experienced under imperial rule. The Alexandrian mint operated on a regnal year system entirely its own, producing bronze coinage for local circulation that was technically distinct from the Roman imperial series — not interchangeable, not exported, and deliberately so. Rome maintained Egypt as a closed monetary zone from Augustus onward, prohibiting the import and export of its coinage to control grain revenue and limit speculative currency arbitrage in the empire's most critical province.