Previous answer is
　Mumei(unsigned) attributed as Katayama Ichimonji　

Special feature:The Ichimonji School had been prospered in Bizen province from early Kamakura to Namboku-cho period. It was one of the two principal Schools prospered in Bizen provinvce ranked with Osafune School. The name Ichimonji was derived from a Chinese character means one or the first that was used as a kind of signature inscribed on the tang. The Ichimonji School was divided broadly into four categories: classical Ko-Ichimonji in the early years, brilliant Fukuoka-Ichimonji of the middle period, remarkably brilliant Yoshioka-Ichimonji in the last period and Katayama-Ichimonji.
This blade is very long Kissaki and lata Kamakura style.
On the surface this blade looks Yoshioka-Ichimonji,
but this blade attribute as Katayama-Ichimonji.

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Appraisal Quiz #601 (August 8th, 2020)
Who made this sword do you think ?
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Blade length : 65.9cm or 25.9inches.
Sori : 1.2cm or 0.47inches.
Mekugi : 2
Width at the hamachi : 2.65cm or 1.04inches.
Width at the Kissaki : 1.81cm or 0.71inches.
Kasane : 0.58cm or 0.22inches.
The weight of the sword 485 grams.
Shape : There are Suriage and Machiokuri
but we can say it is almost a Ubunakago.
Jigane : Ko-itame well grained, beautiful Muji style.
Hamon: Nie-deki, Notare mixed with Ko-gunome-midare.
Sunagashi and Kinsuji work. Boshi is Midarekomi and turn back.

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