Baron Takaharu Mitsui (1900-1983), recognized throughout the philatelic world as Japan’s most distinguished philatelic writer and collector, donated a significant gift of Japanese material to the Smithsonian Institution in 1964. The donation celebrated the opening of the Hall of Philately and Postal History. It included original sketches and final designs of stamps executed by Kasori Teiso between 1923 and 1952.
For forty years, Baron Mitsui served as official adviser of Japan’s Ministry of Connection and Ministry of Post Services. In addition, he contributed prolifically to the body of philatelic literature. He founded and contributed to three journals during his lifetime and published numerous books. His Outline of the Military Postal Systems of the World, co-authored with Professor Yuki Masui and published in 1939, offers the only detailed study of the Japanese military postal service.