This appears to be a copy of a Brasher Doubloon. There are 6 known of the original composed of gold. The design on your coin is not as detailed as the original.
I did a Google search for images and here is what I found.
If it is real, it will have a very prominent BE stamped into either the breast or the wing. If it stamped on the wing, it will ge outside of the borders of the left wing. Yours does not seem to have that. The area where the wings join the body has a definite fake appearance. This coin should weigh 408 grains and be comprised of gold. The coloring in the images doesn't make it appear to be gold. Sorry, but I do not know the conversion between grains, grams, and ounces. Hopefully someone else here will be able to help you with that.
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