Help Identifying Ancient Coin

Your coin is Constantine I from Thessalonica

Constantine I
A.D. 312-313
IMP C CONSTANTINVS PF AVG; laureate, draped and cuirassed bust right.
IOVI CONSERVATORI AVGG NN [To Jupiter,the saviour of our emperors] Jupiter standing l., chlamys across l. shoulder, leaning on sceptre and holding Victory on globe in r. hand; eagle with wreath to l. on ground.
In exergue dot TS dot E dot
RIC VI Thessalonica 61b

This type is often called a follis, some prefer nummus and others use a system based on size- AE4 (less than 17mm), AE3 (17- 21mm), AE2 (21- 25mm), and AE1 (25mm +) where AE means bronze. We don't actually know what the Romans called these bronze coins. I typically use follis or folles for plural.



edit- Here is a link to an article by A.H.M. Jones about the origin of the follis, probably much more than you want to know!

http://www.constantinethegreatcoins...e_Follis.pdf