no website on file — from open-source research, nothing to check against
Legendary state factory in Yixing; masters Gu Jingzhou, Jiang Rong, etc.
closed in 1997, reorganized into a private one; old products highly valued by collectors
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.