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Masamune
Gorō Nyūdō Masamune, working in Sagami province around 1300, is Japan's most celebrated swordsmith. His blades — prized for the misty crystalline structure of their tempered edges — became heirlooms of shoguns and daimyō, several are designated National Treasures, and his name remains the standard of perfection in forged steel.
His most famous blade, the Honjo Masamune, was taken from a battlefield in 1561 by the general Honjō Shigenaga, who survived a stroke from it that split his helmet, and it later passed to the Tokugawa shoguns as an emblem of their dynasty. Designated a National Treasure in 1939, it was handed in to Tokyo police in late 1945 under the Allied occupation's weapons-confiscation orders — and has never been seen since. It remains the most hunted missing sword in the world.
“Make the work well enough and it will carry your name for seven centuries, signature or none.”