40 Nummi - Justin I Cyzicus

Justin I came to power in 518 as an illiterate Macedonian soldier whose nephew Justinian quietly managed much of the actual administration from the start. By 525–527, that co-regency was effectively formalized, meaning coins struck in this final window of Justin's reign were issued under dual authority in all but name. The Cyzicus mint, operating on the Propontis coast, was one of several provincial facilities reactivated under Anastasius I's currency reform of 498 — the reform that reintroduced large-module copper denominations after decades of nearly worthless tiny bronzes.

The Kyzikos mint identifier on these pieces distinguishes them from Constantinople output, which tends to dominate surviving populations.