. The value of Jian Mo's calligraphy is determined by many factors, such as the aesthetic feeling of fonts, writing skills, historical background and cultural value. A calligraphy work of grinding sword has high artistic value and historical value, so its value may be high.
"Grinding sword" refers to a font style in calligraphy. It is a magnificent font, which is often used to write idioms or aphorisms such as "sharpen a sword in ten years and kill the enemy".