I think that the chances of this being from Antissa of the
type shown is very near if not approaching/exactly zero.
Unfortunately I cannot assist with what it is, but I most
definitely believe I can say what it is not.
Can you supply better pictures?
Try less background and clearer detail on the coin. Also,
a smaller file size helps load faster (not a smaller image
size, just file size - they are too big).
Walter
Holt