Seki's smiths chose this valley for its water, not its swords. The Nagara and Tsubo rivers ran clean, the hillsides yielded pine charcoal, and the local clay held heat evenly enough to coat a blade for quenching. Those three ingredients drew swordsmiths from Yamato province in the early fourteenth century, and the craft of seki sword making has not left the city since. The founding figure is Motoshige, who settled here around 1330. His successors formalised a school known for blades that were, in the phrase repeated for six hundred years, unbreakable, unbendable, and sharp enough to cut well. By the Muromachi period more than three hundred smiths worked in Seki, and the town's output armed the campaigns of the Sengoku era. Blades signed Kanemoto and Kanesada travelled far beyond Mino province, and the sanbonsugi hamon — a temper line of three repeating cedar peaks — became the region's visual signature. The Haitorei Edict of 1876 ended the sword trade almost overnight. Seki did not close its forges; it turned them toward kitchen steel, scissors, razors and pocket knives, and today the city produces the majority of Japan's blade exports. That continuity is what distinguishes Seki blade craftsmanship from museum reconstruction elsewhere. The same folding, the same water quench, the same charcoal-fired hearth now shape a gyuto rather than a katana. The Seki Sword Tradition Museum at 9-1 Minamikasuga-cho anchors the public side of this history. Admission is 300 JPY, and the collection sets tamahagane ore, half-finished blades and finished works beside the tools that made them. Doors open at 09:00 and close at 16:30, with the museum closed on Tuesday. Its forge hosts scheduled demonstrations in which a licensed swordsmith and his hammer team work steel at roughly 1,200 degrees; the ringing of the sledges is audible from the courtyard. What visitors encounter through seki sword making tours is therefore a living industrial district rather than a preserved ruin. Damascus patterning, tamahagane smelting, hand-sharpening on natural whetstones and factory-scale grinding all continue within a few kilometres of one another. Guided access to Seki's landmarks of steel — museum galleries, working ateliers, and the Mitsuboshi cutlery works — makes the lineage legible: ore to billet, billet to edge, edge to the everyday object that outlived the weapon.