Previous answer is
MUMEI (CUT SHORTENED) OSAFUNE NARUIE
Special feature : Naruie was a swordsmith of Kozori school in Bizen province.
It is said that Naruie was a descendant of Kagehide in middle Kamakura period, or Naruie was a son of Morimitsu.
Anyway, Naruie was a very skillful swordsmith in Kozori school.
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Appraisal Quiz #520 (January 5th, 2019)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged
Blade length : 51.6 cm or 20.315 inches.
Sori :0.9 cm or 0.354 inches.
Mekugi : 2
Width at the hamachi : 2.98 cm or 1.17 inches.
Width at the Kissaki : 2.27 cm or 0.89 inches.
Kasane : 0.657cm or 0.259 inches.
Shape : The blade is oo suriage mumei(cut shortened) wide
and thick with bo-hi on both sides of the blade
with suitable sori and long kissaki.
Jigane :Koitame hada well grained with jinie attach
and Chirimen style jigane and Utsuru appear on the Ji.
Hamon :konie deki suguha with small ashi and Nezumi ashi.
Boshi:Notare and small round shape.
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