Previous answer is
　　Mumei (Yoshioka Ichimonji)
無銘(吉岡一文字)

Special feature: Yoshioka Ichimonji school started around end of Kamakura
period, next to Fukuoka Ichimonji. Sukemitsu, Sukeshige, Suketsugu,
Sukeyoshi is some of famous Yoshioka Ichimonji’s sword smith.
Work style is same as Fukuoka Ichimonji, Beautiful Jigane with
magnificent Choji-Midare or Gunome-Midare. There are also mixed
both Hamon swords, sometimes we can see Suguha swords.

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Appraisal Quiz #693 (May 28th, 2022)
Who made this sword do you think ?
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Blade length:47.27cm or 18.61inches.
Sori:0.9cm or 0.35inches.
Mekugi:2
Width at the hamachi:3.03cm or 1.19inches.
Kasane: 0.8cm or 0.31inches.
The weight of the sword:470grams.
Era: Bunmei 18, the Muromachi period.
Shape: The blade is long and becomes Mitsumune, is thick and has Bohi and Sanskrit characters on the both sides. Hirauchi Wakizashi in a healthy condition/
Jigane: Koitamehada becomes really fine and Bo-Utsuri appears really clearly.
Hamon: Sakkara Chojiimidare runs from the start till the end. The tip gets sharp and turns back.

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