In traditional Japanese sword-making, which mark was historically used as a form of 'brand identity' that certified the authenticity and craftsmanship of a master swordsmith?

Cultural traditions around the world have developed unique visual identities that tell stories about heritage and craftsmanship. Traditional artisans often incorporate symbolic branding elements that may not be obvious to casual observers but speak volumes to those in the know. This poll explores how traditional craftspeople have used distinctive visual elements in their products long before modern branding concepts existed.

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Mei (signature) engraved on the tang
Tsuba (hand guard) design pattern
Sageo (cord) color pattern
Saya (scabbard) lacquer technique