Previous answer is
　 Mumei (Taima)
無銘（当麻）　

Special feature:Taima is one of the Yamato 5 Schools(Taima, Hosho, Tegai,
Senjuin, Shikkake) and its founder is Kuniyu from the mid Kamakura
period. There are seldom works with Mei, most of them are judged
from Mumei.(Mumei-Kiwame) The style is similar to the Yamashiro-
mono: deep Nioikuchi Suguha, Sunagashi and Kinsuji work elegantly
in Hachu.

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Appraisal Quiz #675 (January 22nd, 2022)
Who made this sword do you think ?
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Blade length:71.81cm or 28.27inches.
Sori:2.27cm or 0.88inches.
Mekugi:3
Width at the hamachi:2.71cm or 1.06inches.
Width at the Kissaki:1.82cm or 0.71inches.
Kasane:0.55cm or 0.21inches.
The weight of the sword:680grams.
Shape: Osuriage, the blade is normally broad. Kissaki is longer and Sori is deeper: well-shaped work.
Jigane: Koitame-hada is mixed with Mokume-hada with lots of Jinie. Utsuri appears to be a clean beautiful Jigane.
Shinogiji: As well as Jigane, Itame-hada nad Mokume-hada arę visible on the surface of Shinogiji.
Hamon: Koashi comes in to the Chu-Suguha. Sunagashi and Kinsuji work really well,
and they becomes smoky towards Ha. Boshi is Midarekomi style and after that Yakizume, and ends with Hadame becoming rough.

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