Dōjigiri
Dōjigiri is a tachi-type Japanese sword that has been identified as a National Treasure of Japan. This sword is one of the "Five Swords Under Heaven" (天下五剣 Tenka-Goken).
Dōjigiri is sometimes called "the yokozuna of all Japanese swords" along with Ōkanehira because of its perfection; it is of great historical value as one of the oldest extant katana-type weapons. The quality and the artistic value of the blade is exquisite, it has been kept in good preservation, and the legend tied to the sword is notable.
Anatomy
The present mounts of the Dojigiri are fine examples of Momoyama-period work in itomaki no tachi style, in which the typical wrapping of the hilt continues along part of the scabbard. The scabbard is decorated in gold nashiji and the metal fittings are of shakudo worked with a nanako ground and bearing the imperial paulownia mon in gilt.It is perhaps the most celebrated of all Japanese swords.