This is a natural finishing stone marketed as "Hideriyama Awasedo," a name that was once distributed within the Japanese cutlery industry during the Showa era. Today, very little documentation remains and examples rarely appear on the market, but its uniform, finely structured stone quality and distinctive coloration reflect the charm of traditional Kyoto natural whetstones.

The stone has an estimated hardness of approximately Lv. 3.5 on the common five-point scale. It absorbs water relatively quickly and begins producing a fine, silky slurry almost immediately, accompanied by a smooth and pleasant sharpening feel. The stone is straightforward and easy to use, making it particularly well suited for kitchen knives.

Rather than producing a highly reflective mirror finish, it creates an elegant kasumi finish with a moderate degree of luster, beautifully enhancing the contrast between the soft iron and hard steel. Its balanced stone quality—neither too soft nor too hard—provides an excellent combination of cutting speed and finishing ability, making it suitable for everything from everyday Japanese kitchen knives to more refined kasumi-finishing work.

While it is not a stone that stands out for dramatic appearance or rarity, it is an honest and dependable performer whose qualities become increasingly appreciated through use. Enjoy the smooth sharpening feel characteristic of traditional Kyoto awasedo and the calm, refined kasumi finish it produces.

 Please note that these are not for beginner sharpeners since they're harder to use.These are natural stones meaning that every single one of them are different so my measured size are not accurate. This is a life time investment for people who lives sharpening their knives and tools, do not hesitate to ask me your questions.”

Dimension : 45-88mm×145mm×31mm ( Approx.) 

Weight: 709g