Previous answer is
Geishu Kuwana Ju Muramasa saku

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.

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Appraisal Quiz #339 (May 15th, 2015)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged

Blade length : 70.30 cm or 27.67 inches.
Sori : 1.35 cm or 0.53 inches.
Mekugi : 2
Width at the hamachi : 3.0 cm or 1.18 inches.
Width at the Kissaki : 2.39 cm or 0.94 inches.
Kasane : 0.68 cm or 0.26 inches.
Shape : The blade is rather wide and thick with suitable sori and long kissaki nice looking shape.
Bo-hi is engraved on both sides of the blade.
Jitetsu : Itame Hada well grained with Jinie attach. Masanagare. This is beautiful Jigane.
Hamon : Nie Deki, deep Nioikiuchi double Ha, Uchinoke fu.
In Ha, there are wide Ashi, Sunagashi and Kinsuji. Boshi is strong Nie　and wide. It is round shape.

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