Previous answer is
Mumei(Osafune Yoshikage)

Special feature : Before Osafune Yoshikage was a stream of Ppmiya school but recently
Yoshikage is a stream of Bize Nagamitsu, Chikakage because the fail mark.
Even right right now some sword expert says the blade is a stream of Cyogi and Kanemitsu.
This sword was judged by Honami Ko-son as Cyo-gi by ggod skilful hand writing.
I think this blade has been kept as Daimyo treasure.
The Jigane is extreamly nice and healthy blade.
This nice quality blade might pass NBTHK upper class.

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Appraisal Quiz #375 (February 19th, 2016)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Blade length : 68.5 cm or 26.96 inches.
Sori : 1.6 cm or 0.62 inches.
Mekugi : 1
Width at the hamachi : 2.87 cm or 1.12 inches.
Width at the Kissaki : 1.79 cm or 0.70 inches.
Kasane : 0.65 cm or 0.25 inches.
Shape : Regular size, Osuriage Mumei Katana. There are Bo-Hi on both side.
Jitetsu : The mixture of Itame Hada and Mokume Hada with Jinie attach.
There are Chikei and Utsuri.
Hamon : Nie Deki, Suguha. The Suguha is rather tight.
Boshi is double Ha, Yakizume style.

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