Previous answer is
Mumei (Sekishu Naotsuna)
無銘(石州直綱)

Features: The Hamon of Sekishu Naotsuna is an exceptionally well-crafted work that is rarely seen.
The nioiguchi is deep, with sunagashi and kinsuji activity inside the blade.
The boshi features double and even triple lines, creating a magnificent appearance.
The jigane is well-forged, with clear chikei, making it a highly recommended piece.
It is especially recommended for those who appreciate the Soshu-den tradition.

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Appraisal Quiz #847 (May 17th, 2025)
Who made this sword do you think ?
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Blade Length: 71.0 cm (27.95 in)
Curvature: 2.1 cm (0.83 in)
Mekugi Hole: 1
Width at Base (Motohaba): 3.48 cm (1.37 in)
Width at Tip (Sakihaba): 2.56 cm (1.01 in)
Thickness of rim (Kasane): 1.02 cm (0.40 in)
Sword Weight: 995 g
Shape:A wide blade with a thick rim and deep curvature.
Jigane:A well-forged small Itame pattern with a clear surface.
Hamon:From the Hamachi, the blade shows a spectacular "Ju-hana-choji" pattern, becoming more flamboyant as the carving ends. The boshi forms a brilliant and disorderly "Ju-hana-choji," marking this piece as a masterpiece.

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Answer will be posted at next Appraisal Quiz.

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