Previous answer is
　Mumei (attributed to Den Rai Kunitoshi)
無銘(伝 来国俊)

Features: Raikunitoshi was active around the mid-Kamakura period, a son of Kuniyuki and known as Rai Magotaro, producing works of high quality and grace.

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Appraisal Quiz #791 (April 20th, 2024)
Who made this sword do you think ?
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Blade length: 71.6 cm (28.19 in).
Curvature: 1.7 cm (0.67 in).
Mekugi holes: 2.
Width at the base (Motohaba): 2.79 cm (1.10 in).
Width at the tip (Sakihaba): 1.69 cm (0.67 in).
Thickness of rim (Kasane): 0.55 cm (0.22 in).
Sword weight: 580 grams.
Shape: Curved towards the tip with a deep presence.
Jigane: Fine ko-itame hada well laid with a scattered 'nijuba' and 'chikei'.
Hamon: Gentle undulating notare with a deep nioiguchi, made of nie with soft features in choji-midare style.
The hamon continues with small irregularities towards the sharp edge.
The hamon is soft and rounded, typical of high artistry.

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