Any idea what this is?
From the first picture it seems like it might be 2 coins stuck together.
That looks to be a scarce ancient Jewish coin if real !!
My first thought is that it's a relatively modern jewelry pendant meant to look like an ancient.
I think it is Greek but really don't have a clue.
It looks like a repro of a First Jewish Revolt shekel, dated year 3 (68-9).
As John Conduitt said: it's a replica of an ancient Jewish coin. These "false shekels" have been made for souvenir, religious or Masonic purposes for centuries. Some are quite realistic-looking, others... have taken some artistic license with the original design. This one is quite realistic, though the edge seam gives it away as a cast replica.
I learned something today!
My mother cooked in a high end restaurant back in the early ‘70’s and was given one as a “tip”. When I started collecting around ‘75 she gave it to me. My coin collecting merit badge counselor was the one to tell me it was fake. I still have it to this day.