Unknown late Roman coin

Hello does anyone know what this coin is? I believe it is late Roman, Constantine I think. 

Clearer photos, weight, diameter and composition please.

Yes, Constantine the Great, IMP CONSTANTINVS AVG. The question is the reverse, could be Genius, Jupiter, Sol, all look similar. I can't read enough of the reverse letters to be sure which one it is. As far as I can tell the mint mark is also unreadable. It should be under the standing figures legs on the reverse.

If I had to take a wild guess I'd say the reverse is IOVI CON-SERVATORI, Jupiter standing. The image fits and I think I see the letter “O” around the end of the reverse where it should be. Something like: N#124894

Unfortunately I think the coin is too far gone to ever be sure.

"imp constantinus avg" 'iovi conservatori avgg"