Tachi Daihannya Nagamitsu. 13th century Japan. Public domain image.

Tachi or Daihannya Nagamitsu by Nagamitsu (Junkei Nagamitsu). The name ("Daihannya") refers to the Daihannya sutra. The value of the sword during the Muromachi period, 600 kan, was associated with the sutra's 600 volumes; said to have belonged to the Ashikaga clan, later in the possession of Oda Nobunaga who gave it to Tokugawa Ieyasu at the Battle of Anegawa, who then gave it to Okudaira Nobumasa at the Battle of Nagashino; curvature: 2.9 cm (1.1 in) Kamakura period, 13th century, around Kench? to Sh?? eras (1249?1293) 73.6 cm (29.0 in) Tokyo National Museum, Tokyo日本語: 　太刀　大般若長光　　室町時代にこの太刀の価格が六百貫だったことから大般若経六百巻にかけてこういうあだ名がついた。　東京国立博物館　所蔵