Seikosha

was a branch of the Japanese company Seiko that produced clocks, watches, shutters, computer printers and other devices. It was the root of the manufacturing companies of the Seiko Group.

==History== thumb|Astron (wristwatch)|Seiko Quartz Astron 35SQ, the world's first commercial quartz watch developed by Suwa Seikosha 1881 — Kintarō Hattori opens the watch and jewelry shop "K. Hattori" (Hattori Tokeiten in Japanese; currently named Seiko Group Corporation) in the Ginza area of Tokyo, Japan. 1892 — is established in Tokyo as the clock manufacturing arm of K. Hattori. 1917 — K. Hattori becomes a company (K. Hattori & Co., Ltd.). 1937 — The watch production division of Seikosha is split off as . 1942 — Daiwa Kogyo, Ltd. is founded in Suwa, Nagano by Hisao Yamazaki. 1943 — Daini Seikosha establishes a factory in Suwa for manufacturing watches with Daiwa Kogyo. 1959 — Daiwa Kogyo and the Suwa Plant of Daini Seikosha merge to form 1961 — Shinshu Seiki Co., Ltd. is established as a subsidiary of Suwa Seikosha. 1970 — Seikosha is split off from K. Hattori & Co., Ltd., and Seikosha Co., Ltd. is incorporated. 1982 — K. Hattori & Co., Ltd. is renamed Hattori Seiko Co., Ltd. 1982 — Shinshu Seiki is renamed Epson Corporation. 1983 — Daini Seikosha is renamed Seiko Instruments & Electronics Ltd. 1985 — Suwa Seikosha and Epson merge to form Seiko Epson Corporation. 1990 — Hattori Seiko Co., Ltd. is renamed Seiko Corporation. 1996 — Seikosha Co., Ltd. is divided into Seiko Precision Inc. and Seiko Clock Inc. 1997 — Seiko Instruments & Electronics is renamed Seiko Instruments Inc. 2007 — Seiko Corporation is renamed Seiko Holdings Corporation. 2009 — Seiko Instruments becomes a wholly owned subsidiary of Seiko Holdings. 2020 — Seiko Precision transfers its business operations to Seiko Time Systems Inc. and Seiko Solutions Inc. and dissolves. 2020 — Seiko Instruments transfers its watch business (development and manufacturing of the Seiko timepieces) to Seiko Watch Corporation. 2021 — Seiko Clock is merged with Seiko Time Systems to form Seiko Time Creation Inc. 2022 — Seiko Holdings Corporation is renamed Seiko Group Corporation.