Previous answer is
□masa(Muramasa) (2nd generation)

Special feature : Muromasa was working at Ise Kuwana province which is called Yoto Muramasa.（specter sword)
Grand father of the Tokugawa Ieyasu Hirotada was assassinated by Muramasa and his son Nobuyasu was
ordered to Seppuku and killed by Muramasa.
Ieyasu himself was injured by Muramasa Yari, so Ieyasu has a vehement hatred of Muramasa.
So Tokugawa Syogun issued impose the ban for holding Muramasa.
Many Daimyo changed the blade to another signature by removing one signature like this Tanto.
Some Daimyo who dislike Tokugawa Syogu liked Muramasa and collected.
The students of the Muramasa are Masashige, Masazane and so on.
I think The Hamon of the Muramasa is very big differen from other sword maker's
The Hamon is square shape gunome midair and same hamon on bit sides of the blade.
In case of the Muramasa, even if the signature removed, the value is not changed a lot compare original signature sword.
Recently it is very hard to buy Muramasa.

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Appraisal Quiz #325 (January 16th, 2015)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged
　
Blade length : 40.90 cm or 16.10 inches.
Sori : 0.75 cm or 0.29 inches.
Mekugi : 1
Width at the hamachi : 2.83 cm or 1.11 inches.
Width at the Kissaki : 3.2 cm or 1.25 inches.
Kasane : 0.9 cm or 0.35 inches.
Weight of Blade: 670 grams.
Shape : :It is called "The devil's knife from the wide(3.83cm) and thickness.
Jitetsu: Jinie appears on the itame-hada. Blackish Jigane.
Hamon: Nie Deki with deep Nioikuchi. In Ha, there are many Sunagashi and Kinsuji.
Boshi is Hakikake Shape.
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