The CONCORDIA MILITVM reverse is definetly the most common type of the early tetrarchy and I do have examples of this type for every emperor of the first tetrarchy. But what I didnt know until one fateful moment when I spotted an unusual coin legend on ebay that this type still was minted during the second tetrarchy! So I won this coin for quite cheap and now am happy owner of an Maximinus II. Caesar - CONCORDIA MILITVM radiant.: While researching I found two things: First this coin seems not to be catalogued on wildwinds.com and second it seems only Alexandria minted these Concordia Militum coins in the name of Maximinus II. One thing that is hard to make out on my coin is the title of the Emperor. The legends read like GAL VAL MAXIMINVS and then it should go on as NOB CAES but the nearly unreadable part on my coin where this belongs looks to short for this legend so feel free to suggest what might be written there Anyways feel free to post your coins with this reverse type from the first or second tetrarchy
These even continue past Constantius I's death to the "3rd tetrarchy" including Severus II as augustus and Constantine as caesar. Here's Constantine, FL VAL CONSTANTINVS NOB CAES, easily confused with his father as caesar FL VAL CONSTANTIVS NOB CAES.
Ok so it looks like only Alexandria continued this type for some years after most mints stopped producing it.
Nice coin @wittwolf I have only this one CONCORDIA MILITVM. RI MAXIMIANUS HERCULIUS 286-305 CE antoninianus Antioch 292-295 CE Pre-Reform CONCORDIA MILITVM Jupiter RIC V 621 H-officina 8
