5 Nummi - Anastasius I Dicorus Constantinopolis, First Large Module Emission, No Officina Letter

Anastasius I's currency reform of 512 AD fundamentally restructured Byzantine bronze coinage after decades of near-worthless small nummi that had made everyday transactions cumbersome. The introduction of large-module folles and their fractions — including this 5 nummi piece — was among the most consequential monetary reforms in Byzantine history, giving copper denominations real transactional utility for the first time in generations.

The absence of an officina letter on this emission distinguishes it as part of the earliest Constantinople production run. Whether this reflects administrative uncertainty during the reform's rollout or simply a brief transitional practice before workshop identification became standardized is still debated among specialists.