Previous answer is
Mumei(Ko-Kongo Hyoe)

Special feature:The blade is wide and thick with blackish jigane which
remind us Kyusyu mono .

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Appraisal Quiz #504 (September 15th, 2018)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Blade length :　67.0　cm or 26.37 inches.
Sori : 1.8 cm or 0.70 inches.
Mekugi : 　2
Width at the hamachi : 2.77 cm or 1.09 inches.
Width at the Kissaki : 2.16 cm or 0.85 inches.
Kasane : 0.58 cm or 0.22 inches.
Shape : Osuriage Mumei Katana, regular width and thickness.
The Kissaki is long, nice shape Katana.
Jigane : Itame Hada well grained with Jinie attach.
There are Utsuri.
Hamon : Ko-Nie Deki, rouned Ko-Gunome Midare with deep Nioikuchi.
In Ha, there are many Sunagashi, Kinsuji, Ashi and Yo.
Boshi is round Hakikake style.

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