Previous answer is
　 Mumei (Aoe)

Special feature:The Aoe School, regarded Yasutsugu in the middle Heian period
as the founder had been prospered at the lower reaches of the Takanashi River in Bichu province.

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Appraisal Quiz #652 (August 6th, 2021)
Who made this sword do you think ?
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Blade length : 70.76 cm or 27.86inches.
Sori :1.67cm or 0.657 inches.
Mekugi : 1
Width at the hamachi : 3.2cm or inches.
Width at the Kissaki : 2.17 cm or 0.854 inches.
Kasane : 0.68cm or 0.27 inches.
The weight of the sword 765 grams.
Shape : Mihaba is wide, kasane is thick,
sori is deep, and kissaki is a good work of Taihai.
Jigane :Koitame hada well grained with jinie attach very attractive hizen jigane which
is calle konuka hada.
Hamon :nioikuchi's deep gunome midare becomes bright and clear,
and kinsuji as lightning in the cumulonimbus clouds of summer clouds,
Sunagashi works and bo-shi is disturbed and returns round.

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