Coin of Magnentius or Magnus Maximus?

[Coriel]

Hi Victor
I have a coin that I have been cleaning but obviously I can't get much further as it is heavily damaged. I can make out a DN MAG on the obverse and the face does look suspiciously like Magnentius, as much of it as can be seen. If only the reverse could be made out, but it is almost completely gone. Do you have any idea what it could be? It is 16mm. 1.85gm.

[Victor]

it is an unofficial coin most likely copying Magnentius.

[Coriel]

Thank you.