A fantasy coin, combining the reverse of a provincial tetradrachm of Roman Egypt (the side with the bust of Zeus) with a reverse imitating something from the Imperial mint at Rome.
Unfortunately, the rarity is irrelevant as it IS a fake. (Although, to give an idea, it was most likely mass produced on modern machines) It doesn't even imitate a genuine type.
Go dig a hole a bury it. This will for sure cause the numismastist of the future fits when he makes the discovery. It will be all over CNN in 2510 A.D.