Previous answer is
Mumei (attributed to Norishige)
無銘(則重)

Features: Norishige, also known as Saeki no Kuro Saburo, resided in Gofuku in Nei-gun, Etchu Province.
He is said to have first trained under Yoshihiro of the same province, then later moved to Soshu and studied under Masamune.
According to Fujishiro, based on period analysis, Norishige is senior to Yoshihiro, and many of his works bear date inscriptions, allowing clear dating of his pieces.

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Appraisal Quiz #877 (December 20th, 2025)
Who made this sword do you think ?
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Blade Length: 2 shaku 2 sun 7 bu (approximately 68.8 cm / 27.09 in)
Curvature: 4 bu (approximately 1.21 cm / 0.48 in)
Mekugi Holes: 2
Width at Base (Motohaba): 3.32 cm (1.31 in)
Width at Tip (Sakihaba): 2.46 cm (0.97 in)
Thickness (Kasane): 0.76 cm (0.30 in)
Sword Weight: 745 g
Shape: The blade has a wide body and a thick kasane, giving a strong impression.
Jigane: Ko-itame hada, well-forged and tightly packed, representing the refined jigane.
Hamon: Nie-deki with gunome-midare, deeply forged nioiguchi reaching the cutting edge—this can be described as a top-grade hamon.

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