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.
Appraisal Quiz #601 (August 8th, 2020)
Who made this sword do you think ?
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.
Hints. ※The picture will be enlarged
Answer will be posted at next Appraisal Quiz.
(Please acknowledge not replying to mail about Appraisal Quiz by our convenience.)