Previous answer is
Mumei (Ko-Ichimonji)
無銘（古一文字）

Features: Ko-Ichimonji blades are early works of the Fukuoka Ichimonji school, characterized by their sense of antiquity.
While this blade originally had a ko-chōji midare hamon, it later evolved into the more flamboyant Fukuoka Ichimonji style.

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Appraisal Quiz #808 (August 17th, 2024)
Who made this sword do you think ?
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Blade Length: 71.4 cm (28.11 in)
Curvature: 2.0 cm (0.79 in)
Mekugi Hole: 2
Width at Base: 2.94 cm (1.16 in)
Width at Tip: 1.96 cm (0.77 in)
Thickness of Rim: 0.72 cm (0.28 in)
Sword Weight: 755 grams
Shape: Deep curvature, with a healthy Boshi.
Jigane: Ko-mokume hada with Ji-nie, producing a refined texture with utsuri.
Hamon: Nioi-based, with active ko-choji. Kin-suji can be observed, with a deeply notare-komi Boshi and visible Kin-suji.

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Answer will be posted at next Appraisal Quiz.

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