Previous answer is
　 Mumei (Senjuin)　

Special feature : This sword is attributed to the Senjyuin school of Yamato province.
Senjyuin is the name of a subsuduary temple of the Todai-ji temple at Nara.
There were two schools: one had its origin in Yukinobu circa Ninhei (1151), consisted of Yukiyoshi, Yoshiyuki,
Ariyuki, Yukimasa, etc. The other had its origin in Shigehiro, circa Nin-an (1166),
consisted of Shigenaga, Shigemura, Yasumura, Shigehisa, etc.
The Senjyuin temple was destroyed in 1567 because of Hidehisa Matsunaga's troop
set it on fire. As the result the school had disappeared.

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Appraisal Quiz #598 (July 18th, 2020)
Who made this sword do you think ?
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Blade length :　69.2　cm or 27.24 inches.
Sori : 2.4cm or 0.945 inches.
Mekugi : 　1
Width at the hamachi : 3.0cm or1.18 inches.
Width at the Kissaki : 2.25 cm or 0.89 inches.
Kasane : 0.8cm or 0.31 inches.
Shape : The blade is regular widthm thickness
with deep sori and longer kissaki nice elegant shape.
Jigane :Koitame hada well grained with jinie attach beautiful Nashiji jigane.
Hamon :Nioi deki suguha from the Hamachi
and then active choji midare
kikka chouji midare. Boshi is round shape.

Hints. ※The picture will be enlarged

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