Aureus - Diocletianus CONCORDIAE AVGG NN

Diocletian's early aurei were struck before the coinage reforms of 294–296, which ultimately abolished the aureus in favor of the lighter solidus-precursor system. This piece falls within that pre-reform window, a period when the gold coinage was already suffering from a decade of weight inconsistency across mints — Diocletian's own early issues varied enough that RIC V.2 entries for this type span multiple officinae and mint attributions with incomplete certainty.

The CONCORDIAE AVGG NN reverse type directly references the co-rule established when Maximian was elevated to Augustus in 286, making the "NN" plural genitive politically pointed rather than formulaic.