Previous answer is
　　Mumei(unsigned) Kanenaga
無銘(兼長)　

Special feature:Befor the war, the blade was appraised as Kaneuji but he submitted the sword to the NBTHK shinsa and received as Kanenaga who is a student of the Kaneuji.
The blade is called Sodenbizen(the blade is sosyu stle and Bizen style convined)
There are many long Kinsuji and Yo and other activities in Ha.

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Appraisal Quiz #683 (March 18th, 2022)
Who made this sword do you think ?
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Blade length: 69.6cm or 27.4inches.
Sori: 1.4 cm or 0.55inches.
Mekugi: 1
Width at the hamachi: 3.2cm or 1.25inches.
Width at the Kissaki: 2.13cm or 0.83inches.
Kasane: 0.66cm or 0.25inches.
The weight of the sword: 730 grams.
Shape: Wide and thick sword with regular Sori and Kissaki.
Jigane: Ko-Itame-Hada well grained, Jinie attached.
Hamon: Niedeki, from Hamachi, Niedeki Suguha then deep Nioikuchi Gunome-Midare.
Ashi worked clearly. Boshi is deep round shape.

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