Only four for me at the present time from A.D.274 to 337. But there is a dilemma, I have purchased A.D. 318-337 with soft cover which is easier to use but my three other are hard cover which is more pleasant to see on a shelf. So, I will probably buy an other A.D. 318-337 with a hard cover only for having a coherent series.
I am hesitating for the next one, A.D. 367-363 or Magnence coinage or (but I will have to wait) the "buste monétaire" 3 volumes series.