Denzo Ishizaki
Although his birth date is officially verified as October 20, 1886, Ishizaki himself claimed to be born two years earlier, and thereby ten days older than Gengan Tonaki who would have been the second-oldest living Japanese man at the time of his death on January 24, 1997, and asserted that his birth record was "delayed by two years", which would have made Ishizaki the oldest living man in Japan after Gihei Oka's death on September 28, 1991 as well as the oldest living Japanese man overall on February 16, 1992 when Russo-Japanese War veteran Mamoru Eto, who was four days younger than Gihei Oka and had emigrated to the United States, died at age 109 years, 13 days and only the second Japanese man who became a supercentenarian, after Eiju Tsuru who died on January 11, 1990.