Previous answer is
Mumei (Den Motoshige)

Special feature : Bizen Osafune Motoshige was called Okura Jyo.
He was the son of Osafune Morishige and the brother of Shigezane.
This blade is Okissaki Nanbokucho period style.
The Jigane is black and blue. And it remind of Aoe's Chirimen Hada.
The Suguha base Hamon is thick with Ashi, Yo and Kinsuji.
This blade is typical Motoshige work. We recommend this piece.
His 6 swords are designated as a Important cultural property.
This is Bizen blade and Saijo Owazamono ranking.

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Appraisal Quiz #381 (April 1st, 2016)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Blade length :　41.6　cm or 16.37 inches.
Sori : 0.4 cm or 0.15 inches.
Mekugi : 　2(1 filled)
Width at the hamachi : 3.39 cm or 1.33 inches.
Kasane : 0.65 cm or 0.25 inches.
Shape : Wide and thick Hirauchi Wakizashi.
Jigane : Itame Hada well grained with Jinie attach. There are Chikei.
Hamon : Nie Deki, Gunome Midare with thick Nioikuchi.
Boshi is his characteristic Notare and Sansaku-fu Hakikake shape.
In Ha, there are Aranie, Sunagashi, Kinsuji and Yubashiri.
This blade is vigorous and his masterpiece.

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