Previous answer is
Mumei (Ko Ichimonji)

Special feature : Founder of Fukuoka Ichimonji school is Norimune. Him and Narimune, Naomune, Muneyoshi, Munetada, Shigehisa, Sadanao are the most old generations of Fukuoka Ichimonji school and they are called as ‘Ko-Ichimonji’, which means ‘old generations’.
The blade looks like Kobizen but Hamon style becomes little new. Elegant gorgeous style Hamon and Jigane is the characterlistics of Ko-Ichimonji.

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Appraisal Quiz #419 (December 24, 2016)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

1:He made a lot of swords during his life, Wakizashi and Katana the most.
2:Generally his sword' shape is long with small sori and long Kissaki.
3:Jigane is very fine Koitame Hada.
4:Hamon is Suguha and then active Gunome Midare with deep Nioikuchi and also Sunagashi, Kinsuji work. Boshi turns round shape.

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