This Roman coin was posted by a member on the Antiquers forum. I have cropped, lightened and combined the poor pictures. My view was it looked like a copy, it just did not look right. however these are not my speciality. He said there is no seam around the edge.
Tough to authenticate a coin from a photo. But my first inclination is that I see no reason to doubt it. It's not an uncommon reverse type--a Constantine "two captives under banner" reverse type, from Sicsia. Some variants can be rare. Not sure about this one. But it doesn't seem the kind of coin one could make a lot of money on by faking. Again, it looks genuine to me. Only possible red flag is that the flan is almost perfectly round for an ancient coin. We will see what others say. Here's one from my collection.
