Previous answer is
Mumei(Den Rai Kunitoshi)

Special feature: Rai Kunitoshi, he was said to be Rai Kuniyuki's son.
There are 2 characters Kanji "Kuni Toshi" and 3 characters Kanji "Rai Kuni Toshi".
There is also a theory that they were the same person.
Their activity period is for 40 years. According to that,
it is quite possible to make sword alone.
However, there is a sllightly differance between the two.
This blade is Osuriage Mumei. The Jigane is so nice.
And also there are clear Utsuri and a lot of activity in the Ha.

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Appraisal Quiz #459 (October 7th, 2017)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Blade length : 77.2cm or 30.39 inches.
Sori : 3.7cm or 1.45 inches.
Mekugi : 　2
Width at the hamachi : 2.98cm or 1.17 inches.
Width at the Kissaki : 1.92 cm or 0.75 inches.
Kasane : 0.65 cm or 0.25 inches.
Shape : Regular width and thickness Katana with large Sori.
The shape is elegant. The Kissaki is relatively long.
There are Bo-Hi on the both side.
Jigane : Itame Hada, O-Itame Hada and Masame Hada mixed with Jinie attach.
There are Shirake Utsuri on the Ji.
Hamon : Ko Nie Deki, tight Suguha. Boshi is round Midarekomi style.
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