(We divide 4 sections for each sword as Saijyo saku, Jyojyo saku
This Mumei (Ko-Naminohira) belongs to Jo saku ranking.
Jyo saku and regular saku)
The blade was polished.
Blade length : 65.7 cm or 25.86 inches.
Sori : 1.9 cm or 0.74 inches.
Mekugi : 3
Width at the hamachi : 2.85 cm or 1.12 inches.
Width at the Kissaki : 1.72 cm or 0.67 inches.
Kasane : 0.68 cm or 0.26 inches.
Era : Kamakura period.
Shape : Regular size blade with deep Sori.
There are Bohi on both side.
Jitetsu : Itame Hada well grained with Jinie attah.
The hada pattern is well seen. There are Shirake-Utsuri on the Ji.
Hamon : Nie Deki Suguha with Ko-Ashi.
Boshi is Midarekomi Hakikake style.
Special feature : Ko-Naminohira was a swordsmith group in Satsuma province
from Heian period, Kamakura, Muromachi, and late Edo period.
Ko-Naminohira is from late Heian period to Nanbokucho period.
Naminohira is from Muromachi period. Late Muromachi period is Sue-Naminohira. These blades are Suguha Hamon.
This blade shows signs of early Kamakura period and admirable.
NBTHK Hozon paper.
Aoi Art estimation paper : whole Oshigata.