I own an Ionian bee like this. The design looks...well, not as enhanced as an ancient one usually looks.
It also has a curious incuse square on the back that doesn't look very convincing - I think I also spy a seam. Incuse squares can look like this but I dont think I've ever seen a theta in one.
Turn the coin in your hand, looking at the rim. Is there a seam? This would help vouych for its authenticity.