Previous answer is
Mumei (Den Norishige)

Special feature: It has been said that Norishige was a student of the Masamune.
But it is commonly called he was a student of Shintogo Kunimitsu at present.
Norishige and Soshu Masamune's blades are alike.
But the Norishige's Jigane has higher varieties Nie.
The texture is Hadadatsu. It is a typical Matsukawa Hada.
The Chikei is wide and many. That is welll said as Norishige.
That's simply overwhelming.

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Appraisal Quiz #477 (Feburary 17th, 2018)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Blade length :　71.0　cm or 27.95 inches.
Sori : 2.2 cm or 0.86 inches.
Mekugi : 　3
Width at the hamachi : 2.29 cm or 0.90 inches.
Width at the Kissaki : 2.11 cm or 0.83 inches.
Kasane : 0.64 cm or 0.25 inches.
Shape : Suriage, Machiokuri Katana. But the signature remain completely.
Jigane : Mokume Hada and Itame Hada grained with Jinie attach.
The characteristic Chirimen Hada. There are Chikei and Utsuri.
Hamon : Nie Deki, Suguha base, There are many Ashi and Yo.
Boshi is Notare style.

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