Previous answer is
Seishu Ju Sengo Masashige

Special feature : Seishu Ju Sengo Masashige is Muramasa school.
Masashige is a student of the Muramasa and this sword is probably 3rd generation Masashige.
The hamon both side is almost same hamon.
Nakago shape is almost as sama as Muramasa.
The Jigane and Hamon both nice work and good condition.
We recommend this sword which is Muramasa school sword.

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Appraisal Quiz #236 (March 22, 2013)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Katana
Blade length : 69.8 cm or 27.48 inches.
Sori : 2.5 cm or 0.98 inches.
Mekugi : 3
Width at the hamachi : 2.74 cm or 1.07 inches.
Width at the Kissaki : 1.74 cm or 0.68 inches.
Kasane : 0.63 cm or 0.24 inches.
Era : Middle Muromachi period Ouan era.
Shape : The blade is regular sized sword with ddp sori nice looking shape.
Jitetsu : Koitame had and mokume had mixed with jinie attach and clear Utsuri appear.
There are some kiss but not so bad.
Hamon : Niedeki cyoji midair with kasha work.
Boshi is midarekomi and turns back.

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