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It mean International Silver company.
The "IS" stamp on a silver spoon likely stands for International Silver Co, which was a prominent American silver manufacturer. The stamp helps to identify the manufacturer of the spoon and can also sometimes indicate the silver content of the piece.
It means International Standard of silver plating thus identifying your piece as silver plate vs. silver
The IS on Wm Rogers Silverware stands for International Silver.
international silver co. but not meaning its a sterling still might be plate
International Silver Company, founded in 1898 from a number of smaller silver manufacturers that specialized in silver plated tableware.
The I S stands for International Silver Company Meriden, Connecticut.
International Silver Company, founded in 1898 from a number of smaller silver manufacturers that specialized in silver plated tableware.
It means International Standard of silver plating thus identifying your piece as silver plate vs. silver
International Silver
International Silver Co. according to the website antiquesandthearts.com
It is probably IS (International Silver) and just hard to read.