Previous answer is
　Mumei(Den Kencho[attributed to Kencho])
無銘(伝兼長)

Special feature: It is said that Kencho was a student of Osafune Nagayoshi.　
His blades are almost Mumei. And his blades with signature are very rare.　
His blades are very similar to Nagayoshi.
But some his blades are more conspicuous Soshuden style than Nagayoshi.

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Appraisal Quiz #734 (March 18th, 2023)
Who made this sword do you think ?
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Blade length:74.8cm or 29.44inches
Sori:3.1cm or 1.22inches
Mekugi:2
Width at the hamachi:3.04cm or 1.19inches
Width at the Kissaki:1.88cm or 0.74inches
Kasane:0.70cm or 0.27inches
The weight of the sword:785grams
Shape: Almost Ubu Nakago. The blade is wide and thick with deep Sori, longer Kissaki.　The blade is a magnificent figure.
Jigane: Ko Itame Hada and Mokume Hada well grained. The texture is clearly visible and Utsuri is well-defined.
Hamon: Ko Nie Deki, bright Choji Midare. The Hamon varies from high to low.

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