Description
ITEM DESCRIPTION:
Comes with kimono or cotton bag. Comes with certificate of supein Nihonto. Comes with copy of Tokosusho. Comes with NTHK Kanteisho Certificate.
Documentation
Documentation
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鑑定書 (Kanteisho / Appraisal certificate)
“Appraisal certificate.”
“One sword (katana).”
“Den / attribution: ‘Hasō’ (波草), Hidetada (秀忠).” (transcribed exactly as written)
“Genuine. Length: 2 shaku 3 sun 8 bu (有之 = ‘recorded as such’).”
“20 December, Reiwa 7” (20/12/2025).
“Non-profit organization: Nihon Tōken Hozon-kai (日本刀剣保存会).”
“Chairman: Ōhashi Hiroshi (大橋博).” (with seal)
B) Technical sheet within the same dossier (No. 第13528号)
Text (as shown):No. 13528.
Mei: mumei (unsigned).
Construction: forged; iori-mune; ubu nakago.
Hamon: yakidashi present, togari-gunome.
Nakago: kesho-yasurime sujikai.
Mekugi-ana: one.
Torokusho / Registration
Text (as shown):
“Firearms and swords registration certificate.”
(Hyōgo) No. 84307.
“Issued: 17 July, Shōwa 50” (17/07/1975).
Type: katana.
Length: 72.0 cm.
Curvature: 1.8 cm.
Mekugi-ana: 1.
Mei (omote): mumei.
Hyōgo Prefectural Board of Education (seal).
Smith, attribution, and context
The blade is registered as mumei. The kanteisho additionally records an attribution to the mastersmith: Hasō Hidetada (秀忠).
Overall, it reads as practical sugata, ubu tang per the dossier, and a hamon featuring yakidashi and a strongly defined togari-gunome rhythm.
Technical description of the blade (hamon → jihada → nakago → geometry/condition)
The hamon is clearly visible as togari-gunome (repeating pointed peaks) with yakidashi at the machi, matching the technical sheet. Fine activity (nie/nioi, sunagashi, etc.).
The nakago is mumei, with one mekugi-ana, and is documented as ubu (生ぶ中心). The sheet specifies 化粧付筋違い (kesho-yasurime sujikai), a formal, presentational filing pattern.
Regarding geometry, based on documentation and visual reading: shinogi-zukuri katana with iori-mune, nagasa 72.0 cm and sori 1.8 cm. The kissaki shows a clear yokote in the full-length shots, consistent with a chū-kissaki proportion.
Mounting (shirasaya)
The sword is housed in a light-wood shirasaya (storage mounting). For a blade of this profile, shirasaya is not a mere accessory: it is the correct solution for long-term preservation, stable storage, and a sober, collector-grade presentation.
Spec sheet
Field Data
Type Katana (刀)
Mei 無銘 (mumei)
Nagasa 72.0 cm (Torokusho) / 二尺三寸八分 ≈ 72.12 cm (Kanteisho)
Sori 1.8 cm
Mekugi-ana 1
Construction 鍛造り・庵棟・生ぶ中心
Hamon 焼き出し有り・尖り互の目
Period (per dossier) 昭和前期
Appraisal dossier No. 13528 (日本刀剣保存会)
Attribution on kanteisho 伝波草 秀忠
