Previous answer is
　Nobutsugu(Aoe)
延次(青江)

Features: Nobutsugu was the son of Aoe Ietsugu and part of the Ko-Aoe school. His works are extremely rare. While Aoe swords typically have many signatures, some, like this tachi, bear tachi-mei. It is said to be from around the Kencho era of the mid-Kamakura period (1249), making it 774 years old. This sword has a single mekugi hole in its ubu nakago, and the yasurime is visible, which is very rare. The tightly forged jigane with prominent chikei is impressive, and the supreme polish has beautifully brought out the fine details of the jigane. The flawless jigane and the bright, clear hamon are captivating and highly recommended. It is a rare piece with ubu nakago and tachi-mei. This sword, which has been carefully preserved for 774 years, should continue to be cherished in the future.

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Appraisal Quiz #801 (June 29th, 2024)
Who made this sword do you think ?
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Blade Length: 62.9 cm (24.76 in)
Curvature: 1.5 cm (0.59 in)
Mekugi Hole: 4
Width at Base: 2.68 cm (1.06 in)
Width at Tip: 1.65 cm (0.65 in)
Thickness of rim: 0.57 cm (0.22 in)
Sword Weight: 505 g
Shape: Slightly narrow blade with a shortened length, slightly long kissaki, deep curvature, and excellent form.
Jigane: Fine ko-itame hada, well-forged with faint utsuri.
Hamon: Matching waves on both sides, mixed with gunome-midare and notare, with a mix of suguha. Bright and clear work.
The boshi returns in a small, rounded manner in the Sansaku style. Also, the valleys of the hamon show active kinsuji.

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