Nihonto Katana “Sasshū Masafusa” with NBTHK Hozon

NBTHK – 鑑定書 (Kanteisho) / Attribution certificate

• Heading: 鑑定書
  Translation: Attribution Certificate

• 一、刀　無銘（薩州正房）
  Translation: One sword (katana), (Sasshū Masafusa).

• 長さ　二尺二寸三分四厘半
  Translation: Length: 2 shaku 2 sun 3 bu 4 rin and a half (approx. 67.7 cm).

• 右は当協会に於て審査の結果保存刀剣と鑑定しこれを証する
  Translation: Following examination by this association, it is appraised as “Hozon Tōken” (a sword worthy of preservation), and this is hereby certified.

• 令和七年五月二十八日
  Translation: 28 May, Reiwa 7 (2025).

• 公益財団法人 日本美術刀剣保存協会
  Translation: Public Interest Incorporated Foundation – Society for the Preservation of the Japanese Art Sword (NBTHK).

• Number: No 3036824
  Translation: No. 3036824.

Torokusho / Prefectural registration (label)

• 香川県教育委員会
  Translation: Kagawa Prefecture Board of Education

• 第17395号
  Translation: No. 17395

• 昭和46年1月21日
  Translation: 21 January, Shōwa 46 (1971)

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Smith, school, period, and context

The NBTHK (Nihon Bijutsu Tōken Hozon Kyōkai)—Japan’s central preservation foundation, established in 1948 under government authorization and the body behind the country’s most influential certification framework (including Hozon)—attributes this blade to 薩州正房 (Sasshū Masafusa).

Masafusa belongs to the historic Satsuma (Kagoshima) group that reshaped local swordmaking in the Edo period. Kagoshima’s documented tradition places Masafusa as the successor to Ujifusa, connecting the line to training in Mino and to the later absorption of Sōshū-den methods—an intentional shift away from the older Naminohira/Yamato axis toward a more forceful, “alive” steel surface. This is not marketing language: it points to jigane rich in ji-nie, more pronounced chikei, and a distinctly Satsuma metallurgical “terrain” that specialists recognize immediately.

Within that regional vocabulary, sources describe hallmark phenomena such as “imozuru” (vine-like lines associated with ji-nie/chikei behavior), along with nie that can visually push into the ji and a characteristic manner of tempering the bōshi known as satsuma-bōshi. This is technical identity, not ornament.

Chronologically, the Masafusa name is documented from early Shintō (17th century) the attribution anchors the work firmly within Edo, broadly c. 17th. 

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Blade

A katana with certified nagasa of 67.7 cm, featuring a dark-patinated nakago with one mekugi-ana visible. The geometry reads clean and purposeful, with taut lines and a classic silhouette. Mid-blade, horimono work is present: on one side, a sharply executed symbolic motif; on the other, a refined set of two fine parallel grooves (suji-hi) accompanied by a small incised mark—adding visual depth without disrupting the elegance of the surface. The result is coherent: controlled ornament where it belongs, and steel kept as the central protagonist.

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Koshirae and thematic coherence

This koshirae is, plainly, museum-grade: impeccable proportion, noble materials, and craftsmanship that speaks through precision rather than spectacle.

The tsuka is wrapped in deep green tsuka-ito over bright samegawa with pronounced nodes, creating a classic high-end contrast. The defining feature is the pair of extraordinarily large menuki, sculptural, high-relief, and gilded: a mounted warrior (kiba musha) motif that turns the grip into functional metalwork, with volume and presence rarely seen in ordinary mountings.

Complementing this are fuchi-kashira in dark metal with extremely fine nanako ground and lively high-relief karako (children) scenes, heightened by gilt accents. The tsuba is a robust, sober plate—built to support the mounting’s main statement rather than compete with it. A gold-toned habaki provides the correct visual closure: bold, luminous, and fully in keeping with the set’s level. The purple sageo finishes the composition with a deliberate aristocratic note.

It is additionally accompanied by a shirasaya in pale wood with ink inscription, ideal for storage and preservation, while the koshirae delivers full historical presence, aesthetics, and function.

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Auxiliary pieces

Presented with a complete koshirae and an ink-inscribed shirasaya.

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Specification sheet

• Type: Katana

• Attribution (NBTHK): Mumei (薩州正房 / Sasshū Masafusa) – Hozon Tōken

• NBTHK certificate: No. 3036824 – 28 May 2025 (Reiwa 7)

• Torokusho (Kagawa): No. 17395 – 21 January 1971 (Shōwa 46)

• Nagasa: 二尺二寸三分四厘半 (approx. 67.7 cm)

• Nakago: mumei, 1 mekugi-ana

• Horimono: symbolic motif + double suji-hi (two parallel grooves) and small incised mark

• Mountings: complete koshirae + inscribed shirasaya