Previous answer is
　 Mumei (Nariie)
無銘 (成家)

Features: Nariie was a swordsmith from Bizen Kozori school and is said to have been a son of Morimitsu. Most of his works are Tanto.

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Appraisal Quiz #794 (May 11th, 2024)
Who made this sword do you think ?
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Blade length: 71.2 cm (28.03 in)
Curvature: 1.6 cm (0.63 in)
Mekugi hole: 1
Width at the base (Motohaba): 3.07 cm (1.21 in)
Width at the tip (Sakihaba): 1.88 cm (0.74 in)
Thickness at the base (Kasane): 0.72 cm (0.28 in)
Sword weight: 715 grams
Shape: Wide body, thick base, deep curvature
Jigane: Well-arranged ko-itame hada, creating a fine and dense structure
Hamon: Nioi-deki with straight Hamon transitioning to turbulent pattern towards the tip, featuring deep Nioi-guchi, sunagashi, and kinsuji

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