How much is Ma Mantang's handwriting worth?

a native of Nanyang, Henan province, a member of Chinese Calligraphers Association, a senior academician of Beijing Huaxia Kyoto Calligraphy and Painting Art Research Institute, a first-class calligrapher of Hong Kong Chinese Artists Association, and a first-class calligrapher of Nanyang Calligraphy and Painting Art Research Institute

He created his own "neutral" calligraphy works with soft and hard strokes. Its characteristics: regular script is full of agility, running script is full of movement, cursive script is like flying, seal script contains peristalsis, and official script vibrates harmoniously.

the price of the work is 1,-3, square feet.