Katana in Koshirae (NBTHK Hozon paper)
Signature : Mumei(unsigned) attributed as Naminohira.
(We divide 4 sections for each sword as Saijyo saku, Jyojyo saku Jyo saku and regular saku)
This sword belongs to regular saku ranking.
The blade was polished.
Habaki : Copper single habaki.
Blade length : 70.3 cm or 27.67 inches.
Sori : 2.6 cm or 1.02 inches.
Mekugi : 1
Width at the hamachi : 2.68 cm or 1.05 inches.
Width at the Kissaki : 1.49 cm or 0.58 inches.
Kasane : 0.6 cm or 0.23 inches.
Era : Early Muromachi period. 1394
Shape : The blade is slender with deep sori nice elegant shape.
Jitetsu : Itame hada and Masame hada mixed, the hada pattern is well seen.
Hamon : Nie deki suguha with komidare hamon and boshi is round shape.
Special feature : The founder of the Naminohira was Heian period to late Edo period gong history.
The blade has passed so many yeras so the blade is rather tired.
Famous sword judge said the the blade is Ko-Naminohira.
NBTHK judged Naminohira. The blade is really antique and elegabt sword.
Tsuba : On the brass tsuba, same waves are engraved.
Fuchikashira : On the iron plate, some plant design is engraved with silver zogan.(inlay)
Saya : Black ishimeji saya.
Menuki : Squirrel is engraved like Ezo style.
NBTHK Hozon paper.
Aoi Art estimation paper : whole Oshigata.