1860: Born in Uneme-cho, Kyobashi, Tokyo.
1874: Apprenticed to Kameda Clock Shop to become a clockmaker (age 13).
1881: Establishes K. Hattori & Co. (age 21).
1885: Starts a business with foreign trading firms in the Yokohama settlement focused on the wholesaling and retailing of western (imported) timepieces (age 25).
1892-1899: Established Seikosha Factory with the main products include wall-clock (since 1892), Pocket Watch (1895) and alarm clock (1899), was regarded as the largest clock dealer and manufacturer in Japan since 1901.
1905: opened the sale agents in Shanghai and Hongkong.
1924: Launched the SEIKO Brand.
1934: died at the age of 73.