Ancient Roman Coin? Not Roman?

It is indeed Roman, of the Constantine era. I see a partial legend starting at the base of the neck and running clockwise-- "DNC(...)VSPFAVG" the AVG stands for Augustus, meaning he was emperor and not Caesar at the time.

On the reverse I see an arm bending at a right angle above some tangled legs. This is the most common late Roman of all, the FEL TEMP REPARATIO type, soldier spearing fallen horseman.

Here is a good reference to the type:
http://www.tesorillo.com/aes/024/024i.htm

The only match to the legend and the reverse is Constantius II, 348-350 AD.

Thank you so much Finn235 and echizento. You guys are great. Since Finn235 pointed out the lettering, I can make them out too. So it is Constantius II, 348-350 AD FEL TEMP REPARATIO I am going with. :)