Previous answer is
　Mumei (attributed as Ayanoko-ji)(Sadatoshi)
無銘（綾小路)定利

Special Feature: Sadatoshi lived in Kyo 4 Jo Ayanokoji. His original name
was Yataro and his buddhist name was Ryoami. He founded
Ayanokoji school. It is said that he and Rai Kuniyuki were neighbors.
His works are designated to the Koto Saijosaku. This work has
almost Ubunakago blade with deep Sori and elegant shape. Utsuri
appears and Boshi is almost gone. Probably it had been preserved
really carefully by Daimyo family, so we can still see its Hamon really
well.

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Appraisal Quiz #680 (February 26th, 2022)
Who made this sword do you think ?
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Blade length: 50.4cm or 19.84inches.
Sori:1.2cm or 0.47inches.
Mekugi:1
Width at the hamachi:2.69cm or 1.05inches.
Width at the Kissaki:1.2cm or 0.47inches.
Kasane:1.0 cm or 0.15inches.
The weight of the sword:450grams.
Shape: The blade is adequately broad with slightly deeper Sori and longer Kissaki.
Jigane: Koitamehada becomes fine and Jigane looks like swirl.
Hamon: Niedeki Gunomemidare. Boshi is sharp like Mimasaka works and turns back round.

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