The stone was found in 1970 by Mr Hatanaka Toishi from Kyoto, who acquired the Nakayama mining rights and quarried it near the top of the mountain. A cutlery wholesaler in Tokyo was cutting the rough stone from an opencast mine. This size is convenient for sharpening razors and smaller tools.
An extremely rare stone of the highest quality, highly prized by collectors. Acquired and stored almost unused. Much heavier than one would expect from such dimensions. Full-size stones of this size are worth tens of thousands of euros in Japan.
It is a truly amazing whetstone, and it is the so-called "without limits". The feel of the response, the fineness of the texture of the abrasive grains, the speed are ideal. It is a top-quality grinding stone in terms of smoothness, polishing strength, etc.
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