Ordering number : 15275
Katana in Shirasaya (NBTHK Hozon paper)
Signature : Oite Toto Chounsai Tsunatoshi tsukuru kore
Keio Gannen 8 gatsu hi (August1865)
(We divide 4 sections for each sword as Saijyo saku, Jyojyo saku, Jyo saku and regular saku)
This Chounsai Tsunatoshi belongs to jyo-yo saku ranking.
The blade was polished.
Blade length : 71.6 cm or 28.18 inches.
Sori : 1.0 cm or 0.39 inches.
Mekugi : 2
Width at the hamachi : 3.20 cm or 1.25 inches.
Width at the Kissaki : 2.35 cm or 0.92 inches.
Kasane : 0.78 cm or 0.30 inches.
Era : Late Edo period.
Shape : The blade is wide and thick with suitable sori and longer kissaki nice looking shape.
Jitetsu : Koitame hada well grained with jinie attach nice well grained Jigane.
Hamon : Niedeki suguha from the Hamachi area and then gunome midare Doranba style with thick nioikuchi in Hamon,
there are sunagashi and Kinsuji work especially hrom the monouchi to Kissakia area, vivid Kinsuji work.
Boshi is thick nioikuchi round shape.
Special feature : Katou Cyousai Tsunatoshi is the third son of Katou Izuminokami Kunihide
He worked as a smith in Uesugi family, the owner of Dewa Yonezawa domain.
Katou Tsunahide are his real brother. Both has studied douranba hamon and Bizenden by Suishinshi Masahide in Edo.
Tsunahide leaves number of douranba pieces yet those are rather stern pieces and valued rather low quality compared with Masahide.
Some of his good pieces are BIzenden with gonome midair ha.
He has many students like koyama Munetsugu, Takahashi Naganobu and Seryuken Moritoshi and so on.
Especially he liked Seryuken Moritoshi personally.
His second generation Tsunatoshi went Suo province to study from Seryuken Moritoshi .
Both Tsunatoshi and Koyama munetsugu’s hamon is very similar.
Some differences are mentioned following. Koyama Munetsugu’s boshi is midarekomi style，
on the other hand Tsunatoshi’s Gunome midair divided 2 prices clover style and round shaped hamon(70%)boshi hamon.
This Tsunatoshi hamon is midarekomi boshi which is rare hamon.
This sword is Doranba style thick nioikuchi active gunome midare mixed.
From the Hamachi area, suguha and then Doranba hamon and gunome midare with thick nioikuchi.
From the Monouchi to Kissaki area, active Kinsuji and sunagashi scatter active hamon.
The sword is wide and thick and long sword with healthy and good work.
NBTHK Hozon paper
Aoi Art estimation paper : whole Oshigata.