Previous answer is
　　Mumei (Bizen Osafune Morishige)
無銘(長船盛重)　

Special Feature: Though it is a judged Mumei, this work is quite marvelous because there are no flaws and defects.

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Appraisal Quiz #685 (April 2nd, 2022)
Who made this sword do you think ?
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Blade 70.0length: cm or 27.55inches.
Sori:1.4cm or 0.55inches.
Mekugi:2
Width at the hamachi:2.79cm or 1.09inches.
Width at the Kissaki:1.89cm or 0.74inches.
Kasane: 0.67cm or 0.26inches.
The weight of the sword: 690grams.
Shape: the blade is broad and thick with slightly deep Sori and longer Kissaki. Well-shaped.
Jigane: Itamehada and Mokumehada, O-Itamehada is mixed.
Hamon: Koniedeki with deep Nioikuchi, Gunomemidare. Kinsuji and Sunagashi work in Hachu actively.

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