Previous answer is
　 Unsigned (Mumei) Naruie.
無銘(成家)

Special feature: This is a large and robust unsigned blade with a wide body and substantial
thickness. Bizen Kuni Nagamune is said to be a descendant of Kagemitsu and was
active during the Nanbokucho Period. He is categorized as a "Ko-Sori" (small curvature)
swordsmith. The signature and style suggest a possible relationship with Kanemitsu,
warranting further research. His skills are considered comparable to those of the
Kanemitsu school, though his work may lack some of their refinement. However, for a
small curvature sword, such a solid and bold work is rare, and the presence of jigane like
this is remarkable. The workmanship is exceptional, and the length of the blade is typical
of the Nanbokucho Period.

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Appraisal Quiz #776 (January 6th, 2024)
Who made this sword do you think ?
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Blade Length: 74.4 centimeters (29.29 inches)
Curvature: 1.5 centimeters ( 0.59 inches)
Nakago Ana (Peg Holes): 2
Motohaba (Width at Base): 2.9 centimeters (1.14 inches)
Sakihaba (Width at Tip): 2.1 centimeters (0.83 inches)
Kasane (Thickness): 0.6 centimeters (0.24 inches)
Sword Weight: 710 grams
Shape: wide body, a broad and deep curvature, and a well-crafted round shape. It features carved Hi (grooves) on both sides, creating a pleasing appearance.
Jigane: The Jihada (grain pattern) is characterized by fine Ko-itame and excellent reflection.
Hamon: The Hamon (temper line) is predominantly straight with small Gunome mixed in, and the Boshi (temper at the tip) is wide and irregular with thick lines.

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