Previous answer is
　 Mumei (unsigned) attributed as Kobizen Toshitsune 　

Special feature: Kobizen Toshitsune is a stream of the Kobizen Masatsune
school. Toshitsune was a son of the Mitsutsune.
Generally Toshitsune is wide and active homon compare with
regular kobizen school which is low temperline.

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Appraisal Quiz #589 ( May 16th, 2020)
Who made this sword do you think ?
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Blade length: 69.8 cm or 27.5 inches.
Sori :1.8 cm or 0.71 inches.
Mekugi : 3
Width at the hamachi :3.0 cm or 1.18 inches.
Width at the Kissaki : 2.4cm or 0.945inches.
Kasane : 0.70 cm or 0.276 inches.
The weight of the sword 820 grams.
Shape : The blade is wide and thick with suitable sori and long Kisski.
The blade has Bo-ho on both sides of the blade.
Jigane : Itame hada well grained with jinie attach and chikei work.
Hamon :Nie deki round shape gunome Midare, ashi ,sunagashi, and kinsuji work.
Bo-shi is round shape thick nioikuchi.

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