Previous answer is
Norinari (Ko-Ichimonji)
則成(古一文字)

Norinari is one of the Ko-Fukuoka Ichimonji smiths along with Norimune and Sukemune, known for flamboyant hamon patterns.
This piece has a clearly legible mei (signature).

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Appraisal Quiz #842 (April 12th, 2025)
Who made this sword do you think ?
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Blade Length: 74.9 cm (29.49 in)
Curvature: 1.1 cm (0.43 in)
Mekugi Hole: 3.19
Width at Base (Motohaba): 2.14 cm (0.84 in)
Width at Tip: 0.54 cm (0.21 in)
Thickness of rim (Kasane): 0.64 cm (0.25 in)
Sword Weight: 790 g
Shape: A long blade (74.9 cm) with solid thickness and a slightly extended kissaki.
Jigane: Fine ko-itame hada, very well forged and clear.
A bright and refined steel appearance.
Hamon: Ko-nie-deki, a straight line with gunome midare.
Includes small ashi and ashi entering the hamon.
The boshi is narrow, turning back in a small round shape

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Answer will be posted at next Appraisal Quiz.

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