Previous answer is
Muramasa (Rewritten as Hiromasa)
Special feature: Muramasa was a son of the Nosyu Akasaka Sahei Kanemura and born at Ise Kuwana province. The hamon and Jigane is very similar with Heianjyo Nagayoshi. I think he had a relationship between them. Generally Muramasa has been reported as most cut well sword and despises sword from Tokugawa family. grandfather od Tokugawa ieyasu and his father Hirotada were killed by usuing Muramasa. heiress of Tokugawa Ieyasu Nobuyasu was also killed bby Muramasa. So Tokugawa family avoid Muramasa swords. Many Daimyo who had Muramasa consealed the sword or on the Muramasa signature remove the whole signature or change the signature by adding one charactore.
Yui Syosetsu well known samurai oppose against Tokugawa family loved Muramasa. In fact, we sometimes find these kind of Muramasa Tanto. We can see 2 kind of Jigane in Moramasa one is typical itame hada with jinie attach blackish jigane and onother one is like this wakizasi. The jigane is very clean with jinie attach and also strong feeling chikei which is beautiful texture. This blade is wide and Mitumine style and same Hamon both side of the blade. From the points, the sword is typical Muramasa.
Some Daimyo opposition against Tokugawa family, changed Muramasa to another name like this sword. So in case of Muramasa, changed name is permitted as Muramasa and good data for historical reason.
Appraisal Quiz #446 (July 8th, 2017)
Who made this sword do you think ?
Hints. ※The picture will be enlarged
Blade length : 67.42 cm or 26.54 inches.
Sori :1.2 cm or 0.47 inches.
Mekugi : 2
Width at the hamachi : 3.1 cm or 1.22 inches.
Width at the Kissaki : 2.42 cm or 0.95 inches.
Kasane : 0.67 cm or 0.26 inches.
Shape : Suriage, Machiokuri Katana. The some parts of signature remains.
Wide and thick blade with Sori.
Jigane : Ko-Itame Hada well grained with Jinie attach.
Blackish Jigane. There are fine Chikei.
Shinogi-Ji: Ko-Itame Hada well grained with Masa Nagare.
Hamon :Nie Deki, Suguha base. There are many Ashi and Yo.
Boshi is flame shape.
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