Previous answer is
Mumei(judged as Kobizen)
無銘（古備前）
Special feature: This work shows nice characteristics of swords from the Heian period.
It has characteristics of Tomonari and Masatsune. Heian sword in a healthy condition.
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Appraisal Quiz #712 (October 15th, 2022)
Who made this sword do you think ?
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Blade length:74.9cm or 29.48inches.
Sori:1.2 cm or 0.47inches.
Mekugi:1
Width at the hamachi :2.85cm or 1.12inches.
Width at the Kissaki:2.02 cm or 0.79inches.
Kasane:0.67cm or 0.26inches.
The weight of the sword:675grams
Shape: The blade is normally thick and broad with deep Sori and longer Kissaki. Well-shaped work.
Jigane: Koitamehada is grained well to be beautiful Jigane.
Hamon: Mainly Suguha, becoming like Notare, with slightly deep Nioikuchi. Ashi and Yo come in slowly. Boshi turns back round and the tip ends with Hakikake.
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