A koto katana, blade 14th-15th century

of koshi-zori, slender shinogi-zukuri with later added futasuji-hi  either side, ko-kissaki, narrow suguba of nioi, very narrow ko-maru boshi, itame-masame-hada, o-suriage nakago with three mekugi-ana (one plugged), mumei, 70.2cm., 27 5/8 in.; brown lacquer saya; iron tsuba carved and pierced on a finely grooved ground with grasses; iron fuchi-kashira