Previous answer is
　 Mumei (Yoshimitsu) 　

Special feature: Osafune Yoshimitsu is said to have been a son of Kagemitsu or Kanemitsu.
His early works look like Kagemitsu and his late works in Nanbokucho　is similar to Kanemitsu's works.

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Appraisal Quiz #567 (December 7th, 2019)
Who made this sword do you think ?
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Blade length : 22 cm or 8.66 inches.
Mekugi : 1
Width at the hamachi : 1.9 cm or 0.75 inches.
Kasane : 0.42 cm or 0.165 inches.
The weight of the sword 100 grams.
Shape : A little small Tanto with a longer Nakago.
Jigane : Well grained Koitame-hada that contains Masame, Jinie attached richly, the pattern of Hada clearly apparent.
Hamon : Symmetrical Hitatsura which looks really gorgeous, Boshi is Midare-komi, there're plenty of Sunagashi and Kinsuji.

Hints. ※The picture will be enlarged

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