Previous answer is
Mumei(Unsigned) (Den Iwato Ichimonji).
無銘(伝　岩戸一文字)

Features: There are several Ichimonji groups including Fukuoka, Yoshioka, Katayama, and Iwato Ichimonji.
This work of Iwato Ichimonji displays beautiful jigane, well-arranged gunome-midare with active yo, and a calmly rounded boshi, expressing the refined and gentle characteristics of the Ichimonji tradition.

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Appraisal Quiz #897 (May 16th, 2026)
Who made this sword do you think ?
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Blade Length: 48.7 cm (19.17 in).
Curvature: 1.2 cm (0.47 in).
Mekugi Hole: 1.
Width at Base (Motohaba): 3.12 cm (1.23 in).
Thickness of rim (Kasane): 0.63 cm (0.25 in).
Sword Weight: 405 grams.
Shape: Wakizashi with slightly wide width and curvature.
Jigane: Well-forged ko-itame hada.
Hamon: Nie-deki, midareba in the style of suguha-based hitatsura. There are many tobiyaki. The boshi is midare-komi and turns back.

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Answer will be posted at next Appraisal Quiz.

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