1787 Brasher Doubloon

Hi, I have a coin 1787 Brasher Doubloon Robinson copy I think it's cooper or brass, anyone can tell me how much can be the value of this coin.

 

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Maybe a dollar.

 

does this coin appear to be a cast copy http://yardsellr.com/for_sale/?utm_content=euHvNFKZ6ndpO6lU0AudIkeUVB0lMIpM%2Fw0qp32SY3k%3D%7C-%7Citem-comment-digest_3368016_368725&utm_medium=item-comment-digest&utm_campaign=item-comment-digest&utm_source=email&eid=euHvNFKZ6ndpO6lU0AudIkeUVB0lMIpM%2Fw0qp32SY3k%3D%7C-%7Citem-comment-digest_3368016_368725#!/1787-brasher-doubloon-or-half-1861-version--3368016