Previous answer is
Unsigned (Mumei) (Nariie 成家)

Features: Nariie of the Bizen Osafune school is said to have been a descendant of Kagehide, the younger brother of Mitsutada. He is traditionally regarded as belonging to the kozori group (a term referring to Osafune smiths outside the Kanemitsu lineage). However, as seen in this work, his style shows similarities to that of Kanemitsu, and the overall form appears more robust than typical late Nanbokuchō examples, suggesting a somewhat earlier period. These characteristics may indicate a connection with Kanemitsu. The Jūyō zufu commentary notes his skill as being equal to, if not surpassing Masamitsu of the Kanemitsu school.

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Appraisal Quiz #894 (April 26th, 2026)
Who made this sword do you think ?
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Blade Length: 78.48 cm (30.90 in).
Curvature: 1.82 cm (0.72 in).
Mekugi Hole: 1.
Width at Base (Motohaba): 3.15 cm (1.24 in).
Width at Tip (Sakihaba): 2.33 cm (0.92 in).
Thickness of rim (Kasane): 0.61 cm (0.24 in).
Sword Weight: 755 g.
Shape: Wide blade, thick kasane, with bo-hi grooves carved on both sides, deep curvature, and a slightly long boshi.
It is also a sufficiently long piece.
Jigane: Well-forged ko-itame hada with visible grain pattern.
Hamon: Nie-deki, gunome-midare, with fine sunagashi and kinsuji activities.

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