Based upon your claim the coin is 13 g and 18K, it has a retail value of about $600.
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1966 gold coin
M
Marc's Expert Appraisal
ANA Life Member · Hudson Valley Numismatics
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High Relief gold coin 1907 I believe.
Peeling counterfeit.
1859-S Liberty Head Double Eagle (Raw)
The retail price of you coin in very fien is about $2,500. If you can get $2,000 out of a dealer or…