AS21510 Tachi : not clear (Ko Naminohira)

Ordering number: AS21510

Tachi in Shirasaya（NBTHK Tokubetsu Hozon Token)

Signature :　not clear (Ko Naminohira)
不明（古波平）　

(We divide 4 sections for each sword as Saijyo saku, Jyojyo saku Jyo saku and regular saku)
This sword belongs to Jyo Jyo Saku ranking.
The blade was polished. by one of the best polisher.
Habaki :　Gold foiled double habaki.
Blade length : 73.8cm or 29.05inches.
Sori :2.4 cm or 0.94inches.
Mekugi : 1
Width at the hamachi :3.24 cm or 1.27inches.
Width at the Kissaki : 1.7 cm or 0.66inches.
Kasane : 0.5cm or 0.19inches.
The weight of the sword:695 grams.
Era : The late Kamakura period.
Shape : Abu-Nakago, the blade is broad and thick and Sori gets deeper
and deeper from the Habaki-Moto, the tip has also Sori.
Jigane :Itame-hada mixed with Mokume-hada to be an elaborate Jigane,
Chikei comes in and Utsuri appears.
Hamon :Nioideki Suguha gets sharp and near the edge it gets vague.
Hachu from Yubiomote near Monouchi and beyond there is a Kitaeware, Boshi barely has Hamon.

Special Feature:The founder of Ko Naminohira was said to be a person who
was named Masakuni from Yamato in the Heian period and moved to
Satsuma Kuni Taniyama Gun Naminohira to make swords, whose
child is called Yukiyasu. Ko Naminohira is far before Nambokucho
period, it is from the late Kamakura period. This work has Ubu
Nakago and in very beautiful shape and we can see the shape it used
to be. In addition, the Mei is unclear but left, maybe it will be clearer
when you care for it elaborately.

From Aoi Art:This work was polished wonderfully so the greatness of
Jigane is visible: Itame-hada, Chikei and Utsuri. Hamon is Nioideki-
Suguha, which goes to Kissaki. Sometimes the works from Satsuma
and Ko Naminohira have that characteristics. Especially, it has Ubu
Nakago, which is rare, unique and interesting to watch. We truly
recommend this one for you. Now it has Tokubetesu Hozon of
NBTHK. If we can read the Mei, the date of production could be earlier up to the Mei.
They say that the Hamon is too close to the edge, but
Ko Naminohira used to be like that, you can see in the past Juyo
Token. Please preserve this masterpiece at home as your family
treasure.

NBTHK Tokubetsu Hozon Token
Aoi Art estimation paper: whole Oshigata.