Previous answer is
Mutsu Daijo Miyoshi Nagamichi Toshiro/Kanbun 10 Inu-Kanoe Nen 8 gatsu hi
Special feature:iyoshi Nagamichi, born Miyoshi Toshiro lived at Matsuyama in Iyo province is a grondson of Nagakuni. Nagakuni was a retained swordsmith of Kato Yoshiaki. Nagakuni and his son Masanaga, the father of Nagamichi went along with the Kato family when they moved to Aizu in O-shu province in 1627. Nagamichi was born in 1633 who was called Michinaga in his youth. Accepting Mutsu-Daijo in 1659, he changed the name to Nagamichi. Mr. Asaemon Yamada, known as a famous cutting tester ranked Nagamitsu Saijo-Owaza-mono in his book as one of twelve excellent swordsmiths at the point of sharpness. Quite a few swords forged by Nagamichi survive with the result of cutting test.
Nagamichi the First passed away in 1685, aged 53. The workmanship of this katana shows
a strong resemblance to Kotetsu who is a representative swordsmith of Edo-shinto.
This blade's Nioikuchi is thight. The Jigane feels strong.
It is rare that there are engraving of "Toshiro" and "Kanbun 10 Inu-Kanoe Nen 8 gatsu hi".
He made this blade at age of 40.
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Appraisal Quiz #451 (August 12th, 2017)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged
Blade length : 68.2 cm or 26.9 inches.
Sori : 1.5 cm or 0.59 inches.
Mekugi : 1
Width at the hamachi : 2.98 cm or 1.17 inches.
Width at the Kissaki : 2.78 cm or 1.09 inches.
Kasane : 0.88 cm or 0.34 inches.
Shape : Wide Nagamaki Suriage Katana with Okkissaki.
Jigane : Itame Hada and Mokume Hada with Oitame.
The blackish Jigane.
Hamon : Ko-Nie Deki, Ko-Gunome Midare with Ashi and Yo.
In Ha, there are Sunagashi and Kinsuji.
Boshi is Midarekomi style with Ashi. There are also Sunagashi and Kinsuji.
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