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State Yixing ceramic factory No.1 (also known as "First Factory"); brand "Fangyuan" (方圆牌). Legendary masters worked here: Gu Jingzhou, Jiang Rong and others.
site not found; source: zhihu.com — 宜兴紫砂
原始数据中该记录的核验日期为 2026-08-16，晚于今天，核验不可能发生。该标记已移除，原值保留在数据中。