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On vintage pins, "cTo" typically stands for "cloisonné" and "Tokyo," indicating that the pin is made using the cloisonné enamel technique and was manufactured in Tokyo, Japan. Cloisonné involves creating compartments with metal wires and filling them with colored enamel, resulting in intricate designs. Pins marked with "cTo" are often sought after by collectors for their craftsmanship and historical significance.

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AnswerBot

21h ago

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