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| 1881 | Establishment by Kintaro Hattori of K. Hattori & Co., Ltd., predecessor of today’s Seiko Corporation. |
| 1892 | Foundation of Seikosha clock supply factory. Production of wall clocks begins. |
| 1895 | Production of fob watches begins. |
| 1899 | Production of alarm clocks begins. |
| 1902 | Production of table clocks and musical clocks begins. |
| 1913 | Production of the first wrist watch made in Japan begins. |
| 1917 | K. Hattori & Co., Ltd. becomes a public company. |
| 1924 | Seiko brand first used on watches. |
| 1937 | Watch production split off as Daini Seikosha Co., Ltd., independent predecessor of today’s Seiko Instruments Inc. |
| 1942 | Establishment of watch producer, Daiwa Kogyo Ltd., predecessor of today’s Seiko Epson Corporation. |
| 1955 | Production of the first self-winding wrist watch made in Japan begins. |
| 1958 | Introduction of quartz clocks for broadcasting use. |
| 1959 | Introduction of transistorised table clocks. |
| 1963 | Development of portable quartz chronometer. |
| 1964 | Seiko serves as Official Timer of Tokyo Olympic Games in Japan. |
| 1968 | Establishment of subsidiary in Hong Kong. |
| 1969 | Introduction of Seiko Astron, world’s first quartz watch (35SQ). |
| 1970 | Establishment of subsidiary in USA. |
| 1971 | Establishment of subsidiary in UK. |
| 1972 | Establishment of subsidiary in the former Federal Republic of Germany. |
| 1973 | Introduction of world’s first LCD quartz watch with six-digit digital display (06LC). |
| 1974 | Establishment of subsidiary in Brazil. |
| 1975 | Introduction of world’s first multi-function digital watch. |
| 1976 | Introduction of world’s first quartz alarm clock. |
| 1977 | Establishment of subsidiary in Australia. |
| 1978 | Establishment of subsidiary in Switzerland. Seiko serves as Official Timer of World Cup Soccer Championships in Argentina. Introduction of world’s first very-fine adjusted ultra-accurate Twin Quartz watch, with less than five seconds deviation per year. |
| 1979 | Establishment of subsidiary in Sweden. Introduction of Pulsar brand. Introduction of Alba brand. |
| 1980 | Establishment of subsidiary in the Netherlands. |
| 1981 | Establishment of representative office in Dubai. Introduction of Lassale brand. |
| 1982 | Seiko serves as Official Timer of World Cup Soccer Championships in Spain. Introduction of world’s first TV watch. Introduction of Lorus brand. |
| 1983 | K. Hattori & Co., Ltd. renamed as Hattori Seiko Co., Ltd. Introduction of world’s first watch with sound-recording functions. |
| 1984 | Introduction of world’s first “talking” clock, the Seiko Pyramid Talk. |
| 1986 | Seiko serves as Official Timer of World Cup Soccer Championships in Mexico. |
| 1987 | Seiko serves as Official Timer of 2nd IAAF World Championships in Athletics in Italy. |
| 1988 | Introduction of quartz watch with sweep second hand. Introduction of world’s first automatic power generating quartz watch. Introduction of world’s first intelligent analogue quartz watch with alarm, chronograph and timer functions controlled by an IC “computer on a chip”. |
| 1989 | Establishment of subsidiary in Thailand. |
| 1990 | Hattori Seiko Co., Ltd. renamed as Seiko Corporation. Seiko serves as Official Timer of World Cup Soccer Championships in Italy. Introduction of the Seiko “The Age of Discovery” collection. Introduction of the Seiko Scubamaster, world’s first computerised diver’s watch to incorporate a dive table. Introduction of the Seiko Receptor Message Watch incorporating a miniaturised FM subcarrier. |
| 1991 | Establishment of subsidiary in Finland. Establishment of subsidiary in Taiwan. Seiko serves as Official Timer of 3rd IAAF World Championships in Athletics in Tokyo, Japan. Introduction of the Seiko Perpetual Calendar with the world’s first “millennium-plus calendar”. |
| 1992 | Seiko serves as Official Timer of Barcelona Olympic Games in Spain. |
| 1993 | Introduction of the “S-YARD” Golf Clubs. |
| 1994 | Establishment of a representative office in Beijing. Seiko serves as Official Timer of Lillehammer Olympic Winter Games in Norway. Introduction of Seiko Kinetic series. |
| 1995 | Introduction of Alba “Spoon” series. |
| 1996 | Establishment of Seiko Optical Products, Inc. Establishment of Seiko Clock Inc. Establishment of Seiko Precision Inc. |
| 1997 | Establishment of Seiko Jewelry Co., Ltd. Changed Japanese company name to Seiko Kabushiki Kaisha. Introduction of Seiko Kinetic Arctura. |
| 1998 | Seiko serves as Official Timer of Nagano Olympic Winter Games in Japan. Introduction of Perpetual Calendar watch driven by world’s first ultrasonic micromotor. Introduction of the Seiko Thermic, the world’s first watch driven by body heat. |
| 1999 | Introduction of the Seiko Kinetic Auto Relay watch, which automatically resumes correct indication of current time. Introduction of hand wound spring-drive watch with quartz accuracy. |