Previous answer is
　Mumei (Ayakoji)
無銘(綾小路)

Features: This blade is attributed to Ayakoji and comes with an appraisal certificate from both NBTHK Hozon Token and similar judgment by Mr. Tanobe. It is a masterpiece from the mid Kamakura period and is currently designated as a Juyo Token. The shape is well-preserved, elegant, and likely once belonged to a high-ranking official. The exact owner from the past is unknown.

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Appraisal Quiz #792 (April 27th, 2024)
Who made this sword do you think ?
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Blade Length: 74.2 cm (29.21 in).
Curvature: 1.2 cm (0.47 in).
Mekugi Hole: 1.
Width at Base: 3.15 cm (1.24 in).
Width at Tip: 2.11 cm (0.83 in).
Thickness of Rim (Kasane): 0.86 cm (0.34 in).
Sword Weight: 890 grams.
Shape: Wide and thick blade with a slightly extended tip. Detailed and dense carvings on both sides.
Jigane: Fine ko-itame hada well kneaded with visible landscape, and exquisite polish. Although Jigane usually shows plain hada, this work reveals well-drawn hada thanks to the top-grade polishing.
The carvings are of the highest quality, resembling a piece I purchased in the USA. The carvings feature more than just dragon motifs; they include bo-hi (grooves).
Carved with the intention of creating motifs, leaving a few centimeters of healthy yakiba (tempered edge).
Hamon:Nioi Deki, Gunome Midare with a sharp tip and return.

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Answer will be posted at next Appraisal Quiz.

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