This is full size 205x76x35mm bench stone that is discounted due to the back bevel seen in the photos. This bevel is full of kawa minerals of ocher. The Narutaki mines produced large stones allowing for creative triming of the edges as seen here. A lifetime of stone for most users the weight is 1233 grams. Included is a really nice tested tomonagura slurry stone which together with the base stone is excellent with a wide variety of blades. It will hone razors but the size suggests a knife or tool stone.
 
This Narutaki is sold with a money back guarantee minus the return shipping.