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I visited the factory of Kiyoken, which is a longstanding shumai bento company in Yokohama. These are Hyochan Soy Sauce Cases at the factory. Hyochan is a brand character of them and this name means gourd (= hyotan in Japanese). It is their shumai bento’s signature. There are many collectors in Japan I heard.
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Hyochan Soy Sauce Cases by Kiyoken
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