National Treasure
Blade for a Dagger ("Tantō"), Named "Atsushi Tōshirō”
短刀（名物 厚藤四郎）
Swords & Armour · Kamakura, 13th centuryTNM
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National Treasure
Blade for a Long Sword ("Tachi")
太刀 銘 長光
At a glance — Swords & Armour · Kamakura period, 13th century · held by Tokyo National Museum · designated National Treasure of Japan · Osafune Nagamitsu.
Fact Sheet
- Designation
- National Treasure (国宝)
- Category
- Swords & Armour
- Date
- 1201–1300
- Creator
- Osafune Nagamitsu (長船長光、長光)
- Held by
- Tokyo National Museum
- Location
- Ueno, Tokyo
- Catalogue ID
- cobas-77855
Find more
- Same period
- Kamakura swords & armour →
- Same creator
- Osafune Nagamitsu →
- At this museum
- All 1632 works here →
This blade was crafted by Nagamitsu, a leading swordsmith in 13th-century Japan. Its thickness and broad shape imbue it with a commanding presence typical of swords from this period. By contrast, the white tempering line is intricately patterned and fades like mist toward the cutting edge, conveying a sense of delicacy.
— Museum description: Tokyo National Museum (CC BY 4.0), via ColBase / Japan Search.
Record & Sources
- Designation: National Treasure (国宝), Government of Japan
- Catalogue ID: cobas-77855 (permanent)
- Official record: Japan Search — jpsearch.go.jp/item/cobas-77855
- Holder's collection: ColBase — Tokyo National Museum
- Photograph: Tokyo National Museum, via ColBase — CC BY 4.0. CC BY 4.0 licence
Cite this page: “Blade for a Long Sword ("Tachi")（太刀 銘 長光）.” Treasures of Japan, catalogue no. cobas-77855. Tokyo National Museum. https://treasures.yamato-kenkou.com/treasures/blade-for-a-long-sword-tachi-77855/ — entry last verified 1 November 2026.
Full record data (as published in the official catalogue record)
- Category: Applied arts:Arms and armor:Blades:Tachi
- Cultural property designation: National Treasure
- Genre: Arms & Armor
- 員数: 1口
- 分類: 刀剣
- 種別: 工芸:武器・武具:刀剣:太刀
- 銘文等: 銘 長光
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