I have this ancient with what I think is a mint mark H Epsilon. I have gone through the references and find nothing with H Epsilon. Any help would be appreciated. Thanks.
Heraclea mint E=5 workshop in the name of Diocletian. I do not have an exact match but mine below is HA or workshop A=1 in the name of Maximianus.
It's a post reform radiate from the Heraclea mint. Does it have DIOCLETIANVS in the obverse inscription?
I haven't cleaned the obverse enough to read it yet. I'm always afraid that I will over clean. I will check it out further. Thanks to you and @dougsmit
The second coin on this page about radiate fractions is your type, but with B = 2 instead of E = 5. http://augustuscoins.com/ed/tetrarchy/radiatefraction.html