Previous answer is
　 Mumei(unsigned) attributed as Nagamitsu.
Kiritsuke Mei Kanoto-Mi 4 Gatsu Kan Mitsunobu Tamesu Kore Hairyo 　

Special feature: It is said although Nagamitsu was a swordsmith of the Osafune founder Mitsutada. There are relatively large number of Nagamitsu blade remaining as Kamakura period. Altogether, the blades are good quality. We can get a glance into their high level skills.
His disciples include Kagemitsu, Chikakage, Sanenaga, etc.

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Appraisal Quiz #576 ( February 15th, 2020)
Who made this sword do you think ?
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Blade length : 69.7 cm or 27.44 inches.
Sori :1.21cm or 0.48inches.
Mekugi : 2
Width at the hamachi : 2.88cm or 1.134 inches.
Width at the Kissaki : 2.08cm or 0.82 inches.
Kasane : 0.6 cm or 0.24 inches.
The weight of the sword 670 grams.
Shape : The sword is O-suriage mumei(cut shortened)
withe regular width thickness and small sori and rather longer kissaaki.
Jigane : Itame hada and O-Itame hada and also mokume hada mixed
with jinie attach and chikei work.
Shinogi ji: itame hada and masa naagare.
Hamon :Nie deki with thick nioikuchi and from the middle part, very active
gunome with thick Jinie double hamon and in Hmon, there are
many sunagashi and Kinsuji work.
Bo-shi is round shape Hakikake style.

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