Previous answer is
　 Mumei(judged as Ichimonji/ Fukuoka)
無銘（一文字/福岡）

Special feature: We have 3 Ichimonji period: Fukuoka Ichimonji in the Kamakura period, Yoshioka Ichimonji in the Nambokucho period, and Kataoka Ichimonji after that. As Dr. Kanzan wrote on the Saya, the blade is very beautiful with nice Choji-ba with elegant atmosphere. Juyo descriptions say that the blade is made from the mid Kamakura period to the late Kamakura period. We think it has been preserved really carefully.

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Appraisal Quiz #750 (July 8th, 2023)
Who made this sword do you think ?
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Blade length:54.5cm or 21.45inches.
Sori:1.4cm or 0.55inches.
Mekugi:1
Width at the hamachi:2.76cm or 1.08inches.
Width at the Kissaki:1.9cm or 0.74inches.
Kasane:0.64cm or 0.25inches.
The weight of the sword:485grams
Shape: Osuriage Mumei. The blade is suitably broad and thick with Bohi on both sides
and deep Sori. Well-shaped work.
Jigane: Koitamehada is clear Utsuri
Hamon: Mainly suguha, Ko-Gunomemidare with Koashi. Boshi turns back rounded.

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Answer will be posted at next Appraisal Quiz.

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