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The Japanese trade dollar was a dollar coin, issued from 1875 to 1877.
It was minted of 27.22 g of silver with a fineness of .900 (90%). The Yen coin had 26.96 g of silver at that time, and otherwise nearly identical in design to the trade dollar. 2,736,000 coins of this type were minted, the vast majority in 1876-77.
When Japan introduced the gold standard in 1897, the silver 1 yen coins, including the trade dollars, were demonetized. The majority of the trade dollars were counter-stamped with the character "gin" (Japanese for "silver"). The Osaka mint placed the mark on the left side of the reverse, the Tokyo mint on the right. The coins were then released for use in Taiwan, Korea and Southern Manchuria.