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It is a tsutsuryo furnace with a watermark of antique copper flowers. It is an open-air cooler with a handle. There is a window at the bottom of the front for ventilation. It may have been hung in a tin bottle with a long bottom, or it may have been made by burning branches instead of charcoal. I added some rocks from the surrounding mountains to raise the level, and installed an alcohol lamp for fun. It is a tea utensil with a good atmosphere that tightens the tea ceremony.