A native of Lan County, Shanxi Province, Zheng is a national second-class artist, a member of the regular script committee of China Calligraphers Association, and a vice chairman of Ningxia Calligraphers Association. His works are rarely seen in the market. A few years ago, there were two of his calligraphy works at the auction of Jiapeng Auction Company in Ningxia, with an estimated value of 500- 1000 yuan/square foot, but none of them were sold.
Your collection is 4 feet long, which is 8 square feet. If estimated by 500 yuan per square foot, it should be around 4,000 yuan.