Cannot determine relationship to "Renshū kantai en'yō kōkai shashinchō" edited by Renshū Kantai Enkō Kinenchō Hensan Iinkai (Tōkyō : Mitsumura Gōshi Kaisha Shuppanbu, 1907), of which "Enkō kinen" appears to be a variant manifestation. Imprint information from digital surrogate of "Renshū kantai en'yō kōkai shashinchō" hosted at National Diet Library of Japan's Digital Collection (shoshi ID 000000485033).
Penn Libraries copy purchased from Shoshi Shinsendō in Tokyo. Penn Libraries copy has ms. note in blue pencil on first leaf "Masujima". Surname matches to only one member of fleet in ships' directory: Masuda Tadao.