Previous answer is
Mumei (Enju)

Special feature : Enju school was reported as Rai Kuniyuki school.
The founder of the Enju was Kunimura and educated many swordsmith like Kunitoshi ,Kunitoki, Kuniyasu. Muniyoshi, Kuninobu and so on.
They worked from late Kamakura period to Nanbokucho period who were very similar with Rai school.

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Appraisal Quiz #317 (November 14th, 2014)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Blade length : 75.6 cm or 29.76 inches.
Sori : 1.5 cm or 0.59 inches.
Mekugi : 2
Width at the hamachi : 2.93 cm or 1.15 inches.
Width at the Kissaki : 1.84 cm or 0.72 inches.
Kasane : 0.73 cm or 0.28 inches.
Shape : Thick and regular size, shallow Sori Katana.
Jitetsu : Itame Hada grained with fine Jinie, Chikei and Midare Utsuri.
Hamon : Ko-Notare, Gunome Midare and Togari-Ha mixed.
Boshi is Hakikake, Midarekomi round shape.
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