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つば屋 Tsubaya
Documented brand
Quick answer
MakerTsubaya (Kappabashi shop brand)RegionTokyo (Kappabashi)
Marksつば屋SteelsShirogami #2, Aogami #2, Molybdenum-vanadium stainless
Knife types madeYanagiba, Deba, Usuba, Gyuto, Santoku, Petty, TakobikiMain useSlicing sashimi and sushi toppings in one pull stroke.
Recommended whetstone1000 → 3000–6000 JIS · how to sharpenMaintenanceRinse and wipe dry immediately after each use — never leave it wet or in the sink.
What this mark means
つば屋 reads Tsubaya. It is a brand name used by Tsubaya (Kappabashi shop brand) (つば屋（合羽橋）), Tokyo (Kappabashi) — the Tokyo region. Shop brand (Kappabashi, Tokyo); forged by others.
About the maker
Knife shop in Tokyo's Kappabashi kitchen-tool street. つば屋 on a blade is a shop brand: the knife was forged elsewhere (Sakai for most single-bevel knives, also Sanjo, Echizen, Seki, Tanegashima) and engraved for the shop. Like Kama-Asa, Korin or Tsukiji Aritsugu, the mark tells you where it was bought, not who forged it.
Products carrying this mark
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