Accompanied by a certificate of registration as 48th Juyo Token [Important Sword] no.11319 issued by the Nihon Bijutsu Token Hozon Kyokai [Society for the Preservation of the Japanese Art Sword] on 11 October 2002.
This smith is known as Ryumon Nobuyoshi. His work is quite rare. He was probably connected to the Senju-in school and worked in two styles. A subdued typical Yamato style as in this blade, or a Bizen like midareba.