This is a vintage Binsui whetstone from a much earlier period, clearly distinct from the Binsui stones that continued to be quarried into the 2000s.

The stone has a warm ivory-colored body, beautifully marked with the distinctive greenish linear patterns characteristic of Binsui. This appearance is rarely seen in the relatively newer Binsui stones that remained in circulation in recent years and gives the stone the unique character associated with older vintage specimens.

The estimated grit is #2,000. Its structure is fine and dense, producing a smooth, almost suction-like sharpening feel. At the same time, it offers ample cutting power, making it highly versatile for both the medium sharpening stage of kitchen knives and the traditional Binsui stage of Japanese sword polishing.

During sharpening, the abrasive particles work consistently and evenly, allowing the edge to be refined with excellent control while providing the pleasant feedback unique to a high-quality natural whetstone. It also performs exceptionally well as a transition stone before moving on to a natural finishing stone (Awasedo).

In recent years, Binsui stones themselves have become increasingly difficult to obtain. Vintage examples from this earlier period are even rarer and seldom appear on the market. As such, this stone is valuable not only as a practical sharpening tool but also as a highly collectible natural whetstone.

Combining excellent sharpening performance with the rarity and historical character preserved through the decades, this is an outstanding piece for both dedicated sharpeners and serious collectors.

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.