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If the piece is stamped "sterling," or "925," then it is real sterling. If it's stamped "IS," the initials stand for "International Silver" Company, an American company founded in 1898 from a conglomeration of smaller companies that specialized in silver plated tableware.

IS, or International Silver, only has a thin (.20 mm) layer of sterling silver over a base metal core. It has no melt value.

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