How much can Xie Zongan's calligraphy be worth, market price and auction record?

The price of each calligrapher's works varies according to his fame, his preferences and the current market situation. I don't know much about Mr. Xie Zongan's calligraphy, but the price of calligraphy is different. Some time ago, due to work reasons, I asked Mr. Fu Jianzeng to write an inscription at a price of about 5,000 square meters. This gentleman has a distinctive calligraphy style and is good at cursive writing, especially left-handed calligraphy. He is currently the vice chairman of China Calligraphers Association. Other details can be found in the information, hoping to bring you some reference value.