Is Liu Zidu's calligraphy collectible?

Liu Zidu's calligraphy is very collectible. Because Mr Liu Zidu was a famous calligrapher in China in the 20th century. As early as 1950s, Mr. Liu Zidu was listed as the first-class calligrapher in contemporary China because of his achievements in the art of seal script. His seal script is dignified and rigorous, fluent and rigid, which is deeply loved by everyone and has the reputation of "the first seal script in the contemporary era". Liu Lao was full of confidence in himself and began to actively participate in various activities in the calligraphy circle, becoming a leading figure in Shaanxi calligraphy circle at that time. Liu Lao led the students in the calligraphy circle to actively participate in various national calligraphy competitions, which made Shaanxi calligraphy circle gradually emerge in the national calligraphy circle and gained a certain popularity.