It certifies Hideo Nakamura's renunciation of his Japanese citizenship. See this object in the California State Universities Japanese American Digitization project site: sac_jaac_2679

English translation of the annotations from "George Naohara photo album" (csudh_nao_0001), page 12: [Right] Japan declared a war, and Japanese Imperial Army attacked Pearl Harbor in Hawaii. When the war broke out, Yuta Masukawa was visiting Little Tokyo, Los Angeles. He rode on a streetcar to get to Little Tokyo and bought a record, "Shina no …