Previous answer is
Mumei (Ko-Konghyoe)
Special feature: It is said that the first generation of Kongo Hyoei Morikuni
is a monk of Dazaifu. He made swords for monk sildier.
The Kongo Hyoe of Nara Yamato school made almost Mumei blades.
But the Kongo Hyoe of Kushu region, there are many swords with inscription. The Nakago shape is Stupa shape. We can find a religious implication in that.
The Jigane is tipical Kyusgu blade. It remind of Sairen or Ko-Naminohira.
The Hamon is Suguha. It looks like Yamato work.
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Appraisal Quiz #493 (June 23rd, 2018)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged
Blade length : 79.0 cm or 31.10 inches.
Sori : 1.06 cm or 0.41 inches.
Mekugi : 1
Width at the hamachi : 3.20 cm or 1.25 inches.
Width at the Kissaki : 2.23 cm or 0.87 inches.
Kasane : 0.65 cm or 0.25 inches.
Shape : Osuriage Mumei long Katana. The Sori is small.
Jitetsu :The Mixture of Itame Hada and Mokume Hada
with Jinie attach. There are Chikei and Utsuri.
Hamon : Nie Deki Suguha base. In the Ha, there are Ashi and Yo.
Boshi is Sansaku style round shape.
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