Tachi in Shirasaya
Signature : Sesshu taniyama □ Naminohira Yasumitsu
(Not guarantee signature)
The blade was polished.
Blade length : 69.6 cm or 27.4 inches.
Sori : 2.3 cm or 0.91 inches.
Mekugi : 1
Width at the hamachi : 2.15 cm or 0.84 inches.
Width at the Kissaki : 1.75 cm or 0.69 inches.
Kasane : 0.61 cm or 0.24 inches.
Era : Mid Muromachi period.
Shape : It is regular width and thickness nice shape katana
Jitetsu : Itame hada well grained with jinie attached. It is clear hada.
Hamon : Nie Deki suguha.
Special feature : Naminohira Yasumitsu is a swordsmith from Kamakura period and has continued until Edo Period.
It is called Sasshu Taniyama. Naminohira is a swordsmith from Kamakura Period and this sword is unlikely to be from Kamakura period from the shape.
It is most likely Mid Muromachi period Naminohira.
The signature looks good, but the condition of the nakago is poor.
Aoi Art estimation paper : whole Oshigata.