Previous answer is
Hizen Kuni Oumi Daijyo Fujiwara Tadahiro (2nd eneration)
Special feature: Tadahiro the Second was born Heisakuro Hashimoto as a legitimate son of Tadayoshi the First.
Tadahiro was only19 years old when his father passed away in1632 but he was enough skillful to forge sword at that time.
Tadahiro designated the Omi-Daijo in 1641, aged 29 and continued not only forging sword
but also supervised many pupils until his death in 1693, aged 80. He is known as a skillful swordsmith
almost all works are above the standard hizen-to. He had been forged sword for a long period of time to leave the largest number
of swords among the swordsmiths of Hizen school. He was good at both of Suguha-hamon and Choji-midare Hamon.
Especially the beauty of jitetsu called konuka-hada is appreciated as the best among the hizen-to.
His swords are ranked at the Owaza-mono because of the sharpness.
This sword is healthy and wide and thick.
I have never seen such kind of wide healthy blade.
The blade is also very healthy without Kizu and flow.
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Appraisal Quiz #570 (December 28th, 2019)
Who made this sword do you think ?
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Blade length : 73.0 cm or 28.74 inches.
Sori : 1.7 cm or 0.66 inches.
Mekugi: 5
Width at the hamachi : 2.96 cm or 1.16 inches.
Width at the Kissaki : 2.05 cm or 0.80 inches.
Kasane : 0.65 cm or 0.25 inches.
The weight of the sword 725 grams.
Shape : the blade is cut shortened Osuriage mumei style.
The blade is regular sized with large Sori.
Jitsu : Itame hada well grained with jinie attach with chikei.
There are Utsuri.
Hamon : Nie deki suguha hamon with double hamon, and Ko Gunome midare. The Boshi is Yakizume and strong Nie with Kinsuji.
Hints. ※The picture will be enlarged
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