Ordering number : 16129
Katana in Shirasaya with Koshirae(NBTHK Tokubetsu Hozon paper)
Signature : Oite Efu Chounsai Tsunatoshi
Tenpo 12 nen 2 gatsu (February 1841)
(We divide 4 sections for each sword as Saijyo saku, Jyojyo saku
Jyo saku and regular saku)
This Chounsai Tsunatoshi belongs to Jyojyo saku ranking.
The blade was polished.
Blade length : 70.2 cm or 27.63 inches.
Sori : 1.7 cm or 0.66 inches.
Mekugi : 1
Width at the hamachi : 3.22 cm or 1.26 inches.
Width at the Kissaki : 2.16 cm or 0.85 inches.
Kasane : 0.86 cm or 0.33 inches.
weight of the blade: 855 grams.
Era : Late Edo period. Around Enpo era.
Shape : Wide and thick Katana with large Sori. Nice shape Katana.
There are Bo-Hi and Soe-Hi on both side.
Jitetsu : Ko Itame Hada grained with Jinie attach. It is clear Jigane.
Hamon : Nioi Deki, Gunome Midare and Choji Midare.
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.
Tsunatoshi’s excellent pupils, from his nephew Ishido Korekazu the seventh down,
Koyama Munetsugu, Takahashi Naganobu, Seiryuken Moritoshi
and others formed an influential school in that period that outstripped
the Suishinshi school in the sphere of Bizen-den.
As you know Tenpo uchi sword which means at the end of Edo period,
many sword makers who were making swords at Tenpo era,
they made swords compete each others.
So at Tenpo era, high rebel swords were made at Tenpo era.
Tsunatoshi is also Tenpo uchi swords are higher than other era.
Tsuba :a dragon is engraved on the iron round shape tsuba. Echizen Kinai school.
Fuchikashira :On the silver plate, a dragon and waves are engraved.
Saya : black ishimeji saya.
Menuki : dragon is engraved by iron plate.
NBTHK Tokubetsu Hozon paper
Aoi Art estimation paper : whole Oshigata.