Previous answer is
Mumei(unsigned) atttributed as Norishige.
Norishige was a student of the Shitogo like Masamune and Yukimitsu.
These sword makers were Sosh-den style.
Norishige is making more active Hamon then other swords smiths.
He made 2 types of the Jigane, both gentle blades and active Ooitame-hada blades.
Gentle Jigane swords has good reputation and good quality.
This blade is one of the best quality Jigane and active, very amazing Hamon.
Appraisal Quiz #401 (August 20th, 2016)
Who made this sword do you think ?
Hints. ※The picture will be enlarged
Blade length : 71.3 cm or 28.1 inches.
Sori : 2.2 cm or 0.87 inches.
Mekugi : 1
Width at the Hamachi : 3.17 cm or 1.25 inches.
Width at the Kissaki : 2.3 cm or 0.91 inches.
Kasane : 0.73 cm or 0.29 inches.
Shape : The blade is Oosuriage Mumei (Cut shortened from stem of the blade) rather wide and thick with deep curve, long Kissaki nice looking shape.
Jigane : Itame-hada and Mokume-hada mixed with Jinie attach Masanagare and Chikei work.
On Jigane, clear active Utsuri appear.
Hamon : Small Notare Gunome-midare Koshibiraki Gunome-midare, Yahazu Ha mixed up.
Yo, Sunagasi and Kinsuji work in Hamon.
Answer will be posted at next Appraisal Quiz.
(Please acknowledge not replying to mail about Appraisal Quiz by our convenience.)