Previous answer is
Mumei(unsigned) attributed as Tegai school

Special feature : The founder of the Tegai started by Kanenaga and continued to Edo period.
In Yamato school, Tegai, Sikkake, Taima, Senjyuin, and Hosho are divided.
These school sword makers were buddhist monks and intensely religious
and made swords with their whole heart.
Generally speaking it is rather easy to distinguish which school belong to the sword.
They adhere strictly to making craft and way like religion so the sword has distinctive jigane and hamon.
Also very few swords has signature.
Yamato tegai Kanenaga is quite well jigane and with thick nioikuchi hamon.
If the blade has item hada and masanagare, the blade must be late Nanbokucho period
or muromachi period buty this sword is more elegant and clear texture.
It is rather difficult to obtain good toga sword.

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Appraisal Quiz #262 (October 4th, 2013)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Blade length : 65.13cm or 25.65inches.
Sori : 1.2cm or 0.47inches.
Mekugi: 1
Width at the hamachi : 3.16cm or 1.24inches.
Width at the Kissaki : 2.68cm or 1.05inches.
Kasane : 0.67cm or 0.26inches.
Shape : Oosuriage Mumei. It is wide and thick daikissaki blade. On the front there is double hi and
on the back there is design of sword and dragon engraved.
Jitetsu : Koitame hada well grained with jinie attached. Utsuri can be observed.
Hamon : Konie base, gunome mixture. The ashi is well put. The boshi is notare style with mix of
gunome. The kissaki is sharply turned back.

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