Previous answer is
　　 Mumei (Den Sa Yoshisada)

Special feature : It is said that Yoshisada was a son of the great Oosa or disciple of the Samonji.
He made pretty many swords during his life.
This blade is Mumei but the style of the Samonji school can be seen on Jigane and Hamon.

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Appraisal Quiz #632 (March 20th, 2020)
Who made this sword do you think ?
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Blade length : 60.0 cm or 23.62 inches.
Sori :1.3 cm or 0.51 inches.
Mekugi : 2
Width at the hamachi : 2.97 cm or 1.16 inches.
Width at the Kissaki : 2.03 cm or 0.79 inches.
Kasane : 0.63 cm or 0.24 inches.
The weight of the sword 515grams.
Shape : Regular width and thickness Katana, longer Kissaki. There are Bo-Hi on both side of the blade.
Jigane : Ko Itame Hada well grained with fine Jinie atatch.
There are Chikei and Midare Ustsuri.
Hamon : Choji Midare, Ko-Choji Midare, Ko-Gunome Midare, Ko-Notare Hamon. There is no height difference.　There are Ko-Ashi and Yo. The Nioikuchi is bright.
Boshi is Notare and round shape.

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