Accompanied by a certificate of registration as a Hozon Token [Sword Worthy of Preservation] issued by the Nihon Bijutsu Token Hozon Kyokai [Society for the Preservation of The Japanese Art Sword] on 24th April 1987
Muttsu no kami Kaneyasu was among the last generations of the Tegai school of Yamato, who migrated to Osaka around the end of the 16th century. Among his pupils was the renowned Iga no kami Kanemichi, whose own pupils included Echigo no kami Kanesada. Kaneyasu is known as Hidari Muttsu from his custom of signing in mirror imagery, as with this blade. Another eccentricity is the rather unusual katte-agari file marks. His known dated works made in Settsu Province (Osaka) are from the Kanei (1624-1644) and Jo-o eras (1652-55). The second generation, originally named Kaneshige, and the adopted son of the first generation, signed Muttsu daijo Kaneyasu, and later Muttsu (no) kami Kaneyasu. He is known to have signed Muttsu no kami Kaneshige in mirror-script, but is often referred to as Migi Muttsu (right Muttsu as opposed to left Muttsu) since he did not sign with the mirror imagery after adopting the name Kaneyasu. He was retained by the Mizuno clan, and worked for a time in Shinano. A well-known blade by this second generation is inscribed kabuto wari [helmet splitter].