Is Zhang's calligraphy valuable?

Worth some money. Zhang is a senior calligrapher with profound artistic attainments. His calligraphy works have unique style, rigorous brushwork, vivid charm and high artistic value, while the number of Zhang's calligraphy works is limited, especially his representative works, which are rare. Because of the limited number of his works, they are particularly precious and have high collection value, so Zhang's words are valuable.