Previous answer is
　 Musashi Daijyo Sakon Korekazu (１st generation)

Special feature: Musashi Daijyo Sakon Korekazu　１st　generation was working at Keian era early Edo period.
He always making Ichimonji style active Choji midair hamon.
At that period, in Edo, there are many sword makers like Mitsuhira,
Tsunemitsu,Korekazu and other sword makers were making Ichimonji style Jigane and hamon.
The style of Ichimonji of the Korekazu is very nice Choji midair hamon
but the shindig ji is massage had and generally Kanbun style so it
is easy to understand his subject.
His school continued 7th generation Korekazu(Ishido Korekazu).
From Aoi Art:Musashi Daijyo Sakon Korekazu is Oumi ishido school and
moved to Edo and made Ichimonji style swords.
I think this sword looks like Nagamitsu utsushi.
From the Hamachi,cyoji midare and continyed to Monouchi area and
then suguha style to Kissaki area and then sansaku style boshi which style is Nagamitsu.
The sword remind us Koto Ichimonji sword.

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Appraisal Quiz #647 (July 3rd, 2021)
Who made this sword do you think ?
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Blade length : 68.8 cm or 27.2 inches.
Sori :2.12 cm or 0.835 inches.
Mekugi : 1
Width at the hamachi : 3.15 cm or 11.24 inches.
Width at the Kissaki : 2.3 cm or 0,9 inches.
Kasane : 0.8 cm or 0.315 inches.
The weight of the sword 820 grams.
Shape : This sword is rather heavy with Ubu style one hole mekugi ana The blade is rather wide and thick with deep sori and long Kissaki nice looking shape.
Jigane :Koitame hada and mokume hada mixed very fine texture and Utsuri appear.
Hamon :Konie deki Gunome midare and cyoji midare mixed with small asha, yo work.
Bo-shi is midarekomi style, and Kinsuji work.

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