Previous answer is
Mumei (attributed to Omiya)
無銘(大宮)　　

Features: The Bizen Omiya school began when the progenitor of the group moved from Omiya in Inokuma, Yamashiro Province, to Bizen.
Signatures such as Bizen Osafune Morikage are known among this school.

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Appraisal Quiz #863 (September 6th, 2025)
Who made this sword do you think ?
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Blade Length: 72.4 cm (28.50 in).
Curvature: 2.1 cm (0.83 in).
Mekugi Hole: 2.
Width at Base (Motohaba): 3.06 cm (1.20 in).
Width at Tip: 1.90 cm (0.75 in).
Thickness of rim (Kasane): 0.84 cm (0.33 in).
Sword Weight: 845 g.
Shape: This sword retains nearly its original condition, bearing a signature in tachi-mei style.
Jigane: Itame-hada with flowing grain and prominent texture.
Hamon: Nioi-based, with a deep nioiguchi forming a midare (irregular) gunome pattern, featuring kinsuji activity and a midarekomi boshi

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Answer will be posted at next Appraisal Quiz.

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