I got a couple of roman coins from a friend, and he couldn't tell me anything about them, he guessed they are from 600 B.C. but I quickly found out, thats not the case. So here is the coin I can't identify... I think it's a Follis from Constantine II but I can't read what's written on it. I hope someone can help! Thank You!
Obverse reads D N CONSTAN-TIVS P F AVG. The reverse reads GLOR-IA EXERC-TIVS and the mint mark is SMK(?) which puts it from Cyzicus. I can not make out the workshop symbol so I can not nail down a particular RIC # for you. Perhaps another set of eyes can make it out. This coin was minted between 337 and 340 A.D.
EDIT: This coin is actually a Constantius II, not Constantine II. Hope this helps!