Seikōsha was a branch of the Japanese company Seiko that produced clocks, watches, shutters, and other devices. It was the root of the manufacturing companies of the Seiko Group.
History
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1881 — Kintarō Hattori opens the watch and jewelry shop "K. Hattori" ( Hattori Tokeiten in Japanese; currently named Seiko) in the Ginza area of Tokyo, Japan.
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1892 — 精工舎 is established in Tokyo as the clock manufacturing arm of K. Hattori.
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1917 — K. Hattori becomes a company (K. Hattori & Co., Ltd.).
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1937 — The watch production division of Seikosha is split off as literally The Second Seikosha.
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1942 — Daiwa Kogyo, Ltd. is founded in Suwa, Nagano by Hisao Yamazaki.
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1943 — Daini Seikosha establishes a factory in Suwa for manufacturing watches with Daiwa Kogyo.
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1959 — Daiwa Kogyo and the Suwa Plant of Daini Seikosha merge to form literally The Seikosha in Suwa
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1961 — Shinshu Seiki Co., Ltd. is established as a subsidiary of Suwa Seikosha.
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1970 — Seikosha is split off from K. Hattori & Co., Ltd., and Seikosha Co., Ltd. is incorporated.
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1982 — K. Hattori & Co., Ltd. is renamed Hattori Seiko Co., Ltd.
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1982 — Shinshu Seiki is renamed Epson Corporation.
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1983 — Daini Seikosha is renamed Seiko Instruments & Electronics Ltd.
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1985 — Suwa Seikosha and Epson merge to form Seiko Epson.
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1990 — Hattori Seiko Co., Ltd. is renamed Seiko Corporation.
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1996 — Seikosha Co., Ltd. is divided into Seiko Precision Inc. and Seiko Clock Inc.
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1997 — Seiko Instruments & Electronics is renamed Seiko Instruments Inc.
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2007 — Seiko Corporation is renamed Seiko Holdings Corporation.
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2009 — Seiko Instruments becomes a wholly owned subsidiary of Seiko Holdings.
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2020 — Seiko Precision transfers its business operations to Seiko Time Systems Inc. and Seiko Solutions Inc. and dissolves.
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2020 — Seiko Instruments transfers its watch business (development and manufacturing of the Seiko timepieces) to Seiko Watch Corporation.
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2021 — Seiko Clock is merged with Seiko Time Systems to form Seiko Time Creation Inc.
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2022 — Seiko Holdings Corporation is renamed Seiko Group Corporation.
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