Where Sakai polishes and Seki scales, Tosa hammers. Kochi's smiths work by free-forging — shaping each blade by eye and hammer rather than fixed dies — producing rugged, affordable, carbon-steel knives and tools with a raw black kurouchi finish. Many are one- or two-person forges.

These four are the Tosa makers most reachable to buyers abroad. Every profile includes a company-profile block with whatever contact detail is publicly verifiable — and honest gaps where a lone smith has no website.