| 1937 |
Daini Seikosha Co., Ltd. (currently Seiko Instruments Inc.) was established as the wristwatch manufacturer for K. Hattori & Co., Ltd. |
| 1939 |
Completed head office factory in Kameido, Tokyo. |
| 1964 |
Served as Official Timer for the Tokyo Olympics. |
| 1967 |
Seiko products captured the highest awards in the Observatoire Cantonal de Neuchâtel competition held in Switzerland. |
| 1968 |
Established Precision Engineering Ltd. as the electronic components manufacturing company (currently Seiko Instruments (H.K.) Ltd., selling electronic components.) |
| 1970 |
Released the world’s first quartz watch using a CMOS IC. |
| 1970 |
Established Morioka Seiko Instruments Inc., the watch manufacturing company. |
| 1973 |
Established Singapore Time Pte. Ltd. (currently Seiko Instruments Singapore Pte. Ltd.) as the watch manufacturing company. (currently manufacturing Thermal Printers.) |
| 1981 |
Established Seiko Instruments U.S.A., Inc. as sales company of diversified products in North America. |
| 1983 |
Established Seiko EG&G Co., Ltd. as a joint company between Seiko Instruments Inc. and EG&G Inc. (currently Perkin Elmer Instruments). |
| 1983 |
Established Seiko Instruments GmbH in Germany as sales company of diversified products in Europe. |
| 1983 |
Company name was officially changed to Seiko Instruments & Electronics Ltd. |
| 1984 |
Established Seiko Precision Co., Ltd. as the electronic components sales company (currently Seiko Instruments Taiwan Inc.) |
| 1988 |
Established Seiko Instruments (Thailand) as the watch components manufacturing company (currently manufacturing HDD components, etc.) |
| 1989 |
Established Dalian Seiko Instruments Inc. as the watch components manufacturing company. |
| 1990 |
New corporate brand name “  ” adopted as official acronym of Seiko Instruments Inc. |
| 1993 |
SII Head Office was relocated to Makuhari. |
| 1997 |
Company name was officially changed to Seiko Instruments Inc. |
| 2001 |
Established SII Printek Inc. as the manufacturing and sales company of printhead products. |
| 2004 |
Opened Shizukuishi Watch Studio, Japan’s only fully-integrated production system for mechanical wristwatches. |
| 2005 |
Established Seiko Instruments (Shanghai) Inc. as the electronic components sales company. |
| 2006 |
Established Seiko Instruments Technology (Shanghai) Inc. as the electronic components manufacturing company. |
| 2009 |
Became a wholly-owned subsidiary of Seiko Holdings Corporation.(currently Seiko Group Corporation.) |
| 2013 |
Established SII Crystal Technology Inc. as the manufacturing company of quartz crystal products. |
| 2016 |
Established SII Semiconductor Corporation as the manufacturing and sales company of semiconductor products. In January 2018, the equity method will be applied and the company name will be changed to ABLIC Inc. |
| 2020 |
Watch business transferred to Seiko Watch Corporation |