Antoninianus - Diocletianus CONCORDIA MILITVM, cuirassed and undraped bust, light version, Cyzicus

Diocletian's CONCORDIA MILITVM issues were central to his systematic effort to rebind the army to imperial authority after decades of third-century instability — the formula "harmony of the soldiers" was not decorative rhetoric but a direct political message aimed at an institution that had made and unmade emperors with alarming regularity. Cyzicus, a major mint on the Propontis reactivated under the Tetrarchy, struck this type in the early years of that system, when coordinating output across multiple mints was itself a logistical achievement.

The "light version" designation reflects the post-reform weight reduction that preceded Diocletian's ultimately unsuccessful currency reforms of 301 AD.