Katana in Shirasaya(NBTHK Tokubetsu Hozon Paper)
Signature: Oite Efu Chojusai Tsunatoshi
Ansei 2 Sai 2gatsu Kichijitsu
Gassaku to(corroborated sword father and a son)
ShinShinto: Jyo Saku: Musashi.
(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 high ranking polisher.
Habaki : silver single habaki.
Blade length : 69.4 cm or 27.3228 inches.
Sori : 2.0cm or 0.787 inches.
Mekugi : 1
Width at the hamachi : 3.18cm or 1.252 inches.
Width at the Kissaki : 2.39 cm or 0.941 inches.
Kasane : 0.83 cm or 0.327 inches.
The weight of the sword 810 grams.
Era : Late Edo period Ansei era.
Shape : The blade is wide and thick with deep sori
and longer kissaki nice looking shape.
Jigane :Koitame had well grained with jinie attach
and visible to tee the texture well.
Hamon : from Hamachi, suguha and chen Choji midare
from the hamachi to kissaki area.
Special feature:Chounsai Tsunatoshi the First forged this katana
at Edo in 1846. Born Kato Hachiro in Dewa province,
present Yamagata pref. as the Third son of Izumi (No) Kami Kunihide
in 1798, learned under Suishinshi Masahide.
Kato Tsunahide, known as its excellent Toran-ba hamon was Tsunatoshi’s elder brother.
Tsunehide moved to Osaka from Edo and learned under Suzuki Harukuni.
After that Tsunahide went to Kyushu Island and forged sword at Kumamoto.
Around 1823, he lived a house of the Uesugi family at Azabu in Edo.
He passed away in 1863, aged 66.
From Aoi Art: This sword is very similar to Koyama Munetsugu.
Generally, Kissaki hamon of Munetsugu is midarekomi style
but Tsunatoshi is round shape.
This sword is corroborated with father Tsunatoshi and his son Koretoshi. It is a rare sword and precious data.
NBTHK Tokubetsu Hozon Token
Aoi Art estimation paper: whole Oshigata.