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Mikawa Nagura Asano Stamps and Glossary

Origin Kanji / Stamps

  • Junzo Kawashiro Nagura – 純三河白名倉
  • Mikawa Shiro Nagura – – 純三河白
    • Not commonly found on the stones themselves.
  • Inspected by Asano – 検浅野
    • Should always be in red ink.

Strata Kanji /Stamps

  • ムシ – Mushi
  • バン – Ban
  • アツ – Atsu (Thick)
  • 八重ボタン – Yae-Botan (Eightfold Peony)
  • ボタン – Botan (Peony) 
  • 天上 – Tenjou (Heavens)
  • 目白 – Mejiro (White-Eye)
  • コマ – Koma (Fine)
  • 鋒錢用 – Hoboyo (Ungraded for Edge Correction)

Visual Grade Kanji / Stamps – Is there a difference?

These do not indicate any difference in end performance for the strata. They are simply a visual identifier for how the stone looks and the slurry tint.

Please note the information in this paragraph is purely anecdotal. I have personally found that the Betsu Dai Jou / Betsu Jou stones are usually a bit harder and thirstier than the striped stones. It can take a bit more effort to get a good slurry going from them, and their slurry tends to feel thinner whereas the Tokkyuu/ Tokkyuu Jou have a more “cushion” feeling to their slurry. This has not impacted any performance that I have been able to measure, but it does change how they feel when used. I like the Betsu Dai / Betsu Jou better personally as I feel I have a more granular control over the slurry thickness. Price and size being equal, I would recommend Tokkyuu / Tokkyuu Jou for most newcomers as I think they are easier to get a nice slurry from and a good functional feel for the stone. I have handled 50+ Mikawa Nagura so I hope though experience reflects your own! As with all topics regarding JNATs, your personal opinion may vary.

  • 刀剣用 – Sword Grade
    • Bench-sized stone. It may be White or Striped.
  • 別大上 – Betsu Dai Jou (Superior Selected Grade)
    • White with Uniform Square Shape
  • 別上 – Betsu Jou (Superior Grade)
    • White with an Odd Shape
  • 上特級 – Tokkyuu Jou (Superior High Grade)
    • Striped with Uniform Square Shape
  • 特級 – Tokkyuu (High Grade)
    • Striped with Odd Shape
  • 高級 – Koukyuu (High Class)
    • Nonspecific