2009
Became a wholly-owned subsidiary of Seiko Holdings Corporation.


2006
Developed the 12 beat movement, providing the world's highest accuracy for mechanical watches.


2005
Developed mercury-free and lead-free silver oxide batteries.


2004
Opened Shizukuishi Watch Studio,Japan's only fully-integrated production system for mechanical wristwatches.


2004
Seiko Instruments Inc. officially changed its company Japanese name.


2002
SEIKO products were selected as the official timekeeping instruments for the Salt Lake City Winter Olympics.


2000
SII establishes the "WINS" strategy


1998

SEIKO products were selected as the official timekeeping instruments for the Nagano Olympics.


1997
Sun Street retail complex opened in Kameido, Tokyo.


1994
SEIKO products were selected as the official timekeeping instruments for the Lillehammer Olympics.


1993
Completed the Sll Makuhari Building and transferred head office, sales, and development operations to the new building.


1992
Sll Group eliminated use of chlorofluorocarbons.
SEIKO products were selected as the official timekeeping instruments for the Barcelona Olympics.


1990
New corporate brand name SII adopted as official acronym of Seiko Instruments Inc.


1988
Completed the world's first automated assembling system for multipurpose, small-lot production of watch movements.


1987
Seiko Instruments & Electronics Ltd. officially renamed Seiko Instruments Inc.


1985
Completed the world's top automated assembly system for multipurpose, small-lot production of outer watch parts.


1983
Daini Seikosha Co., Ltd. officially changed company name to Seiko Instruments & Electronics Ltd.


1976
Received Ohkohchi Memorial Production Special Prize for the development of the "System A" automated watch assembly process.


1970
The Company launched its product diversification activities.


1969
The SEIKO Group introduced the world's first quartz watch.


1967
SEIKO products captured all higher awards in the wrist chronometer class of the Observatoire Cantonal de Neuchatel contest held in Switzerland.


1964
Reflecting its rapid progress in enhancing the accuracy and reliability of timekeeping instruments, SEIKO products were selected as the official timekeeping instruments for the Tokyo Olympics.


1937

K. Hattori & Co., Ltd. established the watch manufacturing department of Seikosha Co., Ltd., its production arm, as a separate company. The new company was named Daini Seikosha Co., Ltd. (presently Sll).


1892
K. Hattori & Co., Ltd. established Seikosha Co., Ltd. and began production of clocks.


1881
Kintaro Hattori established K. Hattori & Co., Ltd. (presently Seiko Corporation), a watch and clock retail store.