I have one of these too, and started a
thread about them not too long ago.
https://www.forumancientcoins.com/board/index.php?topic=123153.0The conclusion I've come to is that they are all
fake.
Yours is the 8th example I've seen. Three of them are in museums, with one apparently having a
provenance over 200 yrs old.
My best guess is that these are
cast fakes. "Modern", but not recent. The
obverse seems to have been copied from a genuine coin. The
reverse may have been copied from a genuine coin too, most likely for
Constantine (this "die pair" is the only one that seems to exist for Licinius - there don't appear to be any genuine coins of this
type made for him).
If I were you I'd throw it in a drawer as a curio and forget about it!
Ben