Previous answer is
Mumei(unsigned) attributed as Taima

Special feature: There are 5 factions in Yamato school which was a founder
Kuniyuki middle Kamakura era. In Yamato school, Tegai, Sikkake, Taima, Senjyuin, and Hosho are divided.
Those swords are almost Mumei. The NBTHK appraised this blade as Taima.
This blade has Itame Hada with Masa. The Jinie is thick Suguha base Hamon.
In Ha, thre are Sunagashi and Kinsuji.

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Appraisal Quiz #516 (December 8th, 2018)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Blade length :　64.4　cm or 25.35 inches.
Sori :0.9cm or 0.35 inches.
Mekugi : 　3
Width at the hamachi :2.86 cm or 1.12 inches.
Width at the Kissaki : 2.0 cm or 0.78 inches.
Kasane : 0.56 cm or 0.22 inches.
Shape : The sword is oosuriage mumei(cut shortened)
rather wide and thick with small sori and long Kissaki.
Jigane :Koitame hada and komokume hada mixed
with thick jinie attach and small utsuri appear beautiful texture.
Hamon :Konie deki suguha small notare mixed and judged
as Yamato Tegai Kanekiyo. inside of the hamon, small ashi,
yo and also sunagashi,
long kinsuji work. The Habuchi is soft like morning mist.

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