Previous answer is
Muramasa(2nd generation)
村正
Special feature:Muramasa 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
Generally The Hamon is square shape gunome midair and same hamon on bit sides of the blade. This blade is gunome midare and suguha hamon which is typical Sengo school.
Recently it is very hard to buy Muramasa.
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Appraisal Quiz #745 (June 3rd, 2023)
Who made this sword do you think ?
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Blade length:66.1cm or 26.02inches.
Sori:1.515cm or 0.59inches.
Mekugi:3
Width at the hamachi:3.00cm or 1.18inches.
Width at the Kissaki:2.05cm or 0.80inches.
Kasane:0.70cm or 0.27inches.
The weight of the sword:730grams
Shape: The blade is broad and thick. The edge has enough thickness.
The blade has slightly deep Sori and longer Kissaki. Well-shaped work.
Jigane: The blade apparently seems dense, but there are some rough texture when we see it very precisely. There are Chikei and light Utsuri.
Hamon: Niedeki sodt Gunomemidare with deep Nioikuchi. Sunagashi and Kinsuji work in Ha. Boshi is rounded and the tip is soft Hakikake like flames. There are some Kinsuji at the tip.
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