no website on file — from open-source research, nothing to check against
State-owned Yixing pottery factory No.1 (also known as the 'First Factory'); brand 'Fangyuan' (方圆牌). Legendary masters worked here: Gu Jingzhou, Jiang Rong, and others.
website not found; source: zhihu.com — 宜兴紫砂
The source export carried a verification date of 2026-08-16 — later than today, so the check could not have happened. The mark was removed; the original value is kept in the data.