The coin is made of 90% silver and 10% copper, weighing 27.22 grams (420 grains). coin was minted by the U.S. Mint to compete with other large silver trade coins in East Asia Trade dollars were struck from 1873-1885, but only for circulation through 1878; afterwards, only proof coins were available to collectors Thickness:3.0mm Diameter: 37.8mm Coin is in very good condition please see pictures
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