Shohonyama Ōhira Uchigumori Japanese Natural Whetstone — Tokkyū Grade (2,632g)
Approx. 209 × 77 × 69 mm
An authentic, extra-thick Tokkyū (Special Grade) Uchigumori natural whetstone from the legendary Ōhira Mine in Kyoto, Japan.
This premium stone displays a clean, classic appearance that is characteristic of the finest Uchigumori stones. Its substantial thickness and impressive weight make it an increasingly rare find in today's market.
Ōhira Uchigumori stones are highly revered and have traditionally been used in the final stages of Japanese sword polishing. Being slightly harder than typical Uchigumori, this particular stone offers both exceptional polishing power and a highly refined finish.
It produces a flawless, misty Kasumi finish that beautifully highlights the Hamon (temper line) and Jihada (forged steel grain pattern).
Specifications & Features
Origin: Shohonyama, Ōhira Mine (Kyoto, Japan)
Type: Uchigumori (with fine hairline suji)
Grade: Tokkyū (Special Grade)
Format: Extra-Thick Block
Dimensions: Approx. 209 × 77 × 69 mm
Weight: 2,632 g
Hardness: Medium to Semi-Hard
(Excellent polishing response and versatility)
Condition: Unused
(Professionally lapped, chamfered, and ready for immediate use)
Suji (Lines): Fine hairline only
(Cosmetic in nature and completely safe for sharpening)
Protection: Sides and bottom sealed with Ishisan premium water-based protective lacquer
Performance & Application
• Traditional finishing stone for Japanese sword polishing
• Produces a highly refined and elegant Kasumi finish
• Enhances visibility of the Hamon and Jihada
• Excellent polishing performance with controlled cutting action
• Ideal for premium kitchen knives and laminated blades
• Suitable for woodworking chisels (Nomi) and plane blades (Kanna)
• Smooth sharpening feel with excellent finishing capability
Recommended For
Japanese Sword Polishing
Traditional restoration and finishing work for Nihonto and other fine blades.
Kitchen Knives
Creating a premium Kasumi finish on high-end carbon steel and laminated knives.
Carpentry Tools
Precision finishing for chisels, plane irons, and other woodworking tools.
Collectors
A rare, investment-grade specimen combining outstanding performance and collectible value.
Collector's Note
High-grade Ōhira Uchigumori stones of this size, thickness, and condition have become increasingly difficult to source. The combination of Tokkyū grading, exceptional dimensions, and practical usability makes this an especially desirable example.
Equally suited for professional polishing work and serious collections, this stone represents the enduring legacy of Kyoto's most celebrated natural whetstone region.
Authentic Shohonyama Ōhira Uchigumori — Tokkyū Grade.
Rare extra-thick specimen with excellent polishing characteristics.
Massive 2,632 g natural whetstone from Kyoto, Japan.
A premium collector-grade and professional-use Japanese natural finishing stone.
