The Chelsea, a cast iron mechanical pencil sharpener, was manufactured ca.1901 by the Chelsea Manufacturing Company of 200 Main Street, Chelsea, Michigan. Identifying insignia includes the term "Pat Ap'd For." The sharpening disks were made of flint sandpaper and was advertised for $2. The Chelsea may also have been manufactured by the American News Company and a name variant may have been labeled as the Standard Pencil Sharpener.

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