Japanese Sword Online Museum

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Katana: Mumei attributed as Ko-Naminohira


Katana in Shirasaya with Koshirae (Guarantee : NBTHK Hozon paper)
Signature : Mumei (unsigned) attributed as Ko-Naminohira.
(We divide 4 sections for each sword as Saijo saku, Jojo saku, Jo saku and regular saku)
Sayagaki was done by Dr. Tanobe Sensei : Satuma Koku Ko-Naminohira Jidai Late Kamakura period mixed with Yamato school.
The blade is typical simple atmosphere. The length is 2 Shaku 1 Sun 9 Bu (26.13 inches)

This sword belongs to Jo saku ranking.

The blade is polished.
Habaki : Gold foiled double Habaki.
Blade length : 66.36 cm or 26.13 inches.
Sori : 2.27cm or 0.9 inches.
Mekugi : 1
Width at the Hamachi : 2.78 or 1.09 inches.
Width at the Kissaki : 1.81 cm or 0.71 inches.
Kasane : 0.65 cm or 0.26 inches.
Era : Late Kamakura period. (About 7 centuries ago)
Shape : The blade is osuriage mumei (cut shortened).
blade is standard width and thickness with deep curve nice elegant shape.
Jigane : Koitame-hada and Mokume-hada mixed with Jinie attach. Soft feeling Jigane and Utsuri appear on syrface of the blade.
Shinigi ji : Koitame-hada and Mokume-hada mixed. Same as Hiraji.
Hamon : Konie-deki Suguha and Uchinoke Hamon with small Ashi work. Boshi turnes round shape.
Special feature : Satsuma Naminohira started from late Heian era and continued up to Kamakura, Nanbokucho, Muromachi and Edo period for long long term.
This blade is typical Naminohira style Suguha Hamon with Uchinoke and small Ashi.
Feeling of Jigane is tender such like the skin of graceful young lady with Utsuri appearing. We call such style of Jigane ‘Mochi-hada’.
There are some very small openings here and there. These are the proof of hand forged with folding the hot iron for numerous times.
Dr. Tanobe Sensei's Sayagaki is the most reliable estimation for this blade.
We are hoping this amazing sword still, keeping the beautiness and faculty for nearly 7 centuryies, would find nice owner whoum treat the blade right and takes care to inherit for more far future.

Koshirae :
Saya : Some designs are lacquered on black Saya.
Tsuba : Wild geese engraved openwork on round iron Sukashi Tsuba.
Menuki : Hollyhock family crests (which belong to Tokugawa Shogunate) are carved on copper plate with gold color.

Guarantee : NBTHK Hozon paper (If purchaser want to submit blade for NBTHK Shinsa, asisitional fee takes ¥27,000.)
Aoi Art estimation paper : whole Oshigata.

Price : JPY ¥600,000-.