AR22 - Severus Alexander L Γ

Year 3 of Severus Alexander's reign, struck at Alexandria's imperial mint under the distinctive Egyptian regnal-year system that reset with each emperor's accession. The billon tetradrachm series from this period reflects the progressive debasement of Egypt's closed currency system, which Rome had maintained as a monetary quarantine zone since Augustus — provincial coinage that could not legally circulate outside Egypt, and foreign coinage that could not legally circulate within it.

Milne 2872 places this squarely in the well-documented Alexandrian sequence, cross-referenced by Dattari and Köln without significant die discrepancies noted among the type.