Will need more quality pictures for an determination. Keep the coin right side up, try to focus the camera by keeping it still as much as possible, and if you are using a smartphone, then you can crop the outer edges of blank area.
No, I don't believe it is authentic but it looks like the fake dies may have been impressed upon an authentic late Roman bronze. Where did you get it this coin and did you have any reason to trust that the seller had an authentic, rare, and valuable late Roman usurper? Here's your coin properly oriented, cropped, and joined followed by a match from Forum Ancient Coins' Fakes Gallery: FAC fakes match: https://www.forumancientcoins.com/fakes/displayimage.php?album=search&cat=0&pos=8 Here's a thread you will find helpful for researching such things in the future: https://www.cointalk.com/threads/ancient-coins-beginners’-faq-thread.324858/ Within that thread, a post about assessing value and about researching and spotting fakes: https://www.cointalk.com/threads/ancient-coins-beginners’-faq-thread.324858/page-2#post-3222342
Absolutely, positively fake. The very first giveaway is the odd angle photo. When you see a coin pictured upside down and slanted in such a way that you can barely tell what it is don't you at least wonder why the seller would do this?
