Calligraphy work' refers to Imperial letters, examples of handwriting by well-known calligraphers of Japan and China, ancient writings, ink calligraphy, calligraphy copybooks, and any other written works (in Japan) of historical significance by deceased calligraphers.
「書跡」は宸翰、和漢名家筆跡、古筆、墨跡、法帖等で日本の書道史上の遺品を指す。