This is a vintage Carborundum sharpening stone with a fine grit, accompanied by its original box. The stone is green and measures around 6 inches in length. It was made in the United States and is an original product. The brand is Carborundum and the type of stone is a slip stone. It is a blade sharpener and falls under the category of blade parts, supplies, and accessories.

As pictured as is

Outer box faded advertising