Japanese Natural Whetstone Shobudani Ozakiyama Tomae 183g Selected by Yamamoto for Razors

Shōhonyama Shōbudani Ozakiyama Tomae — 正本山 菖蒲谷 尾崎山 戸前

Shōbudani is regarded as one of Kyoto's most highly respected areas for Japanese natural whetstones, alongside such famous sources as Nakayama and Okudo. For generations, this area produced high-quality finishing stones used for sharpening and polishing Japanese swords, kitchen knives, planes, chisels, straight razors, and a wide variety of edged tools.

Seller's description: 正本山菖蒲谷 尾崎山 戸前

Shōhonyama (正本山) — a traditional designation associated with high-quality Kyoto natural finishing stones.
Shōbudani (菖蒲谷) — a historic whetstone mining area/system in Umegahata, Kyoto.
Ozakiyama (尾崎山) — a specific mountain or mining locality associated with the Shōbudani area.
Tomae (戸前) — the geological layer from which the stone originates.

Dimensions: 104 × 70 × 11 mm
Weight: 183 g
Hardness: 4.5/5
Estimated grit: 10,000+

The stone has an attractive greenish-grey colour and an exceptionally dense and homogeneous structure. Based on its colour and surface characteristics, it can be described as a Shōbu Asagi type stone. Its high hardness and very fine structure make it particularly suitable as a finishing stone for straight razors and other tools requiring an extremely refined and clean cutting edge.

Stamp

梅ケ畑砥石 中勝 山本男系山主精選

Approximate meaning:

梅ケ畑砥石 — Umegahata whetstone.
中勝 (Nakakatsu) — seller/dealer.
山本男系山主精選 — approximately, “carefully selected by the male lineage of the Yamamoto family, quarry/mountain owners.”

The 山本男系山主精選 stamp gives the stone additional collector interest and indicates selection associated with the Yamamoto family, a historically important name in the world of Umegahata natural whetstones.

Historical background

The history of whetstone quarrying in the Shōbudani area extends back many centuries. Stones from Shōbudani and Nakayama have traditionally been highly valued for their exceptionally fine abrasive properties and their suitability for polishing Japanese swords and precision cutting tools.

Numerous historical traditions surrounding these areas describe restrictions on quarrying and the supply of the finest stones to authorities and professional sword polishers. In later periods, Umegahata natural whetstones became increasingly available to craftsmen, carpenters, woodworkers, and makers and users of edged tools.

The term Hon-yama / Honyama (本山) has historical associations with Kyoto's most prestigious natural finishing-stone sources, although in the modern whetstone trade the term is used much more broadly. Shōbudani and Nakayama remain among the best-known historic whetstone sources of the Umegahata area.