Previous answer is
Mumei (Bizen Osafune Sanenaga)

Special feature: Sanenaga is a son of the great Mitsutada.
Sanenaga like to make suguha hamon with small ashi
and well grained Jigane with Utsuri.
The top of Bizen school is Nagamitsu control Kagemitsu,
Chikakagem Sanenaga and these sword makers make Sansaku
Bo-shi on the Kissaki hamon.
It is said that The most beautiful Jigane was made by Sanenaga.

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Appraisal Quiz #531 (March 23rd, 2019)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Blade length : 70.0 cm or 27.55 inches.
Sori : 1.8 cm or 0.7 inches.
Mekugi : 2
Width at the hamachi : 2.96 cm or 1.16 inches.
Width at the Kissaki : 2.09 cm or 0.82 inches.
Kasane : 0.65 cm or 0.25 inches.
Shape : The blade is wide and thick with deep sori oosuriage (cut shortened) which is called oosuriage mumei.
Both sides of the blade has Bo-hi are engraved.
Jitetsu : Koitame hada and Komokume hada mixed with much jinie attach and also Chikei work.
Hamon : Niedeki suguha and noter hamon convined and in Ha, there are many ash, Yo and also small kinsuji scatter.
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