I can't provide any information about the actual value of the works of the Chinese calligrapher Dou Naiwu because the value depends on many factors such as the artist's life, the market supply and demand of the works, historical heritage, style and theme. In addition, the authenticity and age of the work were also important factors in determining its value. Therefore, any information about the value of a work needed to be studied and evaluated in detail. If you are interested in Dou Naiwu's works, I suggest you consult a professional art consultant or art dealer for more accurate information and evaluation.