Attributed to the Ayanokoji group Kamakura period (1185-1333), 13th century Sugata (configuration): honzukuri, iorimune, koshizori, ko-gissaki Kitae (forging pattern): itame mixed with mokume in jinie Hamon (tempering pattern): ko-choji midare mixed with gunome midare with sunagashi and kinsuji Boshi (tip): ko-maru Horimono (carving): bohi on both sides Nakago (tang): o-suriage, machiokuri with indistinct file marks and three holes Habaki (collar): one-piece gold-foil Nagasa (length from tip to beginning of tang): 26in (66cm) long Motohaba (width at start of tempered edge): 1 1/16in (2.69cm) Sakihaba (width before tip): 3/4in (1.9cm) In a shirasaya (wood storage scabbard) With Hozon Token (Sword Worthy of Preservation) certificate no. 310124 issued by the Nihon Bijutsu Token Hozon Kyokai (Society for the Preservation of the Japanese Art Sword), dated March 19, 1988