1881: K. Hattori, predecessor of today's Seiko Holdings Corporation, established.
1892: Seikosha clock supply factory established; production of wall clocks begins.
1913: Production of Laurel, the first wristwatch made in Japan, begins.
1917: K. Hattori & Co., Ltd. incorporated.
1924: SEIKO brand first used on watches.
1930: Production of camera shutters begins.
1937: Watch production split off as Daini Seikosha Co., Ltd., predecessor of today's Seiko Instruments Inc.

1947: Retail division split off as Wako Co., Ltd.
1949: K. Hattori & Co., Ltd. listed on the Tokyo Stock Exchange.
1953: Seiko sponsors Japan's first TV commercial.
1958: Seiko commercialises quartz clocks for broadcasting use.
1959: Suwa Factory of Daini Seikosha becomes independent as Suwa Seikosha, predecessor of today's Seiko Epson Corporation.
1964: Seiko serves as Official Timer of the Tokyo Olympic Games.
1969: Seiko introduces the world's first quartz watch.
1970: Seikosha becomes an independent company.
1972: Seiko serves as Official Timer of the Sapporo Winter Olympic Games.
1982: Seiko introduces the world's first TV watch.
1983: K. Hattori & Co., Ltd. renamed Hattori Seiko Co., Ltd.
1984: Seiko sets up SEIKO Mullion Clock, Japan's first large-sized marionette clock.
1988: Seiko introduces the world's first ″Auto Quartz″ watch (later renamed as ″Kinetic″).
1990: Hattori Seiko Co., Ltd. renamed Seiko Corporation.
1992: Seiko serves as Official Timer of the Barcelona Olympic Games.
1993: Seiko introduces the S-Yard golf clubs.
1994: Seiko serves as Official Timer of the Lillehammer Winter Olympic Games.
1996: Seiko Precision Inc., Seiko Clock Inc., and Seiko Optical Products, Co., Ltd. established.
1997: Seiko introduces the world's first backside progressive addition lens. Japanese company name changed to Seiko Kabushiki Kaisha.
1998: Seiko serves as Official Timer of the Nagano Winter Olympic Games.
1999: Seiko introduces the world's first Spring Drive watch.

2000: Seiko S-Yard Co., Ltd. established.
2001: Seiko Watch Corporation established. Seiko Corporation becomes a pure holding company.
2002: Seiko serves as Official Timer of the Salt Lake City Winter Olympic Games.
2007: Seiko Corporation renamed Seiko Holdings Corporation. Seiko serves as Official Timer of the IAAF World Championships in Athletics in Osaka.