Previous answer is
　　 Hizen Kuni Kawachi Daijo Masahiro (first generation)
肥前国河内大掾藤原正広(初代)

Specila feature: Hizen koku Kawachi Daijo Fujiwara Masahiro was
a son of the Yoshinobu who was called Masanaga and at kanei 2nd November
he changed his name to Masahiro. He passes away at Kanbun 5th Feb, 5th age 59.
He made many swords for 2nd generation Tadahiro.
He made unusual Cumulonimbus cloud style hamon and well repotted from that period.
Even in modern times, many sword collectors collect his swords.
This blade is thick nioikuchi gunome midare hamon and looks first generational
of the Musashi daijyo Tadahiro. We undestand the high technique of his blade.
The sword is very healthy without Kizu and flow.
And also the blade was polished by highest ranking polisher.

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Appraisal Quiz #691 (May 14th, 2022)
Who made this sword do you think ?
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Blade length : 75.3 cm or 29.64 inches.
Sori : 0.4 cm or 0.15 inches.
Mekugi : 1
Width at the hamachi : 3.08　cm or 1.21 inches.
Width at the Kissaki : 2.0 cm or 0.78 inches.
Kasane : 0.79 cm or 0.31 inches.
Shape : Regular width and thickness Katana with shallow Sori.
Jitetsu :Itame-Hada grained with Jinie.
Hamon: Niedeki Gunome-Midare.
Boshi is round and ends with Hakigake.

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