Previous answer is
　　Mumei attribute as Gassan 　

Special feature:Gassan is the name of one of a holy mountain
in Yamagata pref, where had been prospered gathering ascetics,
merchants and swordsmiths from ancient times.
Swordsmiths lived at the base of Mt. Gassan formed a school
and forged swords with peculiar texture of Jagane called Ayasugi-hada
around the Kamakura period. On and after the middle Muromachi period,
swordsmiths started to inscribe their individual swordsmith name on the
sword tang. The school once declined in the Edo period. Gassan Sadayoshi
moved to Osaka and revived the tradition in the last Edo period.
It has succeeded continuously until today.

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Appraisal Quiz #615 (November 14th 2020)
Who made this sword do you think ?
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Blade length : 73.1 cm or 28.7 inches.
Sori : 1.0cm or inches.
Mekugi : 1
Width at the hamachi : 3.2cm or 1.25 inches.
Width at the Kissaki : 2.3cm or 0.9 inches.
Kasane : 0.8cm or 0.31inches.
The weight of the sword 875 grams.
Shape : Wide and thick, shallow Sori and Chu-Kissaki.
Jigane :Ko-Itame-hada well grained. Jinie attached beautiful Jigane.
Hamon : Niedeki Gunome-Midare. Choji Midare and Ashi mixed.
Sunagashi and Kinsuji worked. Boshi is Notare round shape.

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Answer will be posted at next Appraisal Quiz.

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