Starting with the 18th century, a number of European, American and Japanese silver coins (generically known as the trade dollar) began circulating in the Far East. Each merchant's firm had its own mark and, after heavy circulation, the design of the coin became completely obliterated by the chop marks. “For common dates, chopmarks significantly lower the value of the coin, sometimes by 50 percent or more,” Reimer said. “Also, it depends to. Asian merchants would punch “chop marks” in the coin's surface to both identify it and to test its purity. In PCGS began certifying Trade.
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