Previous answer is
Nagamitsu (Ichiryushi)
Special feature : Yoshikane is said the son of Kobizen Nagakane.
Jigane is Itame-hada with Mokume-hada mixed with Chikei.
Hamon is slim Suguha with Ko-Midare, Ko-Gonome Midare are mixed with Nie attached.
Kinsuji Sunagasi can be seen well. Boshi has double, triple part, Kinsuji working.
Clear signature remained for nearly millennium is astounding.
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Appraisal Quiz #397 (July 23rd 2016)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged
Blade length : 70.5 cm or 27.8 inches.
Sori : 1.7 cm or0.67 inches.
Mekugi : １
Width at the hamachi : 3.0 cm or 1.18 inches.
Width at the Kissaki : 2.0 cm or 0.79 inches.
Kasane : ０.４５ cm or 0.18 inches.
Shape : The blade is regular size with deep Sori and longer Kissaki,
On both sides of the blade has Bo-Hi and Soe-hi engraved.
Jigane : Koitame Hada well grained with Jinie attach beautiful nice texture.
Hamon : Koniedeki Gunome-midare and Choji-midare mixed and Midarekomi style Boshi.
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