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The coin is brass not gold, the names are on the front of the coin.
It depends on which denomination coin you have. A $10 coin has more gold than a $5 coin.
If the coin is dated between 1840-1907 there is .12094oz pure gold in the coin.
If the coin is a modern gold bullion coin it is 1/4oz of pure gold. If it's a pre-1933 coin it has .48375oz of pure gold in it.
a gold coin of course Heads or Tails ? A gold coin