At a glance
- Period
- 20th–21st century
The watchmaking story
Useful places to start with Kunio Koike's work include Spring Drive control-circuit development and Grand Seiko calibre 9R. 1
Kunio Koike worked for or held a role at Seiko Epson and Grand Seiko. 1
Scope: Direct watchmaking
Why this person is included
Documented original contribution
Background and working context
Affiliations and workshops: Seiko Epson; Grand Seiko 1
Geographic ties: Japan. Documented principal work / project location; not a citizenship assertion 1
Brands, workshops, and other relationships
- Movement / component supplier or manufacturer · Inherited source-linked record; relationship classification reviewed, sources not reopened
Seiko Epson — Worked for / held role. Low-power circuit engineer 1
Legacy affiliation: Seiko Epson; Grand Seiko. Person-level contribution: Developed low-power circuit solutions with the Spring Drive team, helping make mainspring-powered electronic regulation practical.
Original affiliation wording: Seiko Epson; Grand Seiko. No present-day employment or ownership inferred.
- Watch brand / watchmaking business · Inherited source-linked record; relationship classification reviewed, sources not reopened
Grand Seiko — Worked for / held role. Low-power circuit engineer 1
Legacy affiliation: Seiko Epson; Grand Seiko. Person-level contribution: Developed low-power circuit solutions with the Spring Drive team, helping make mainspring-powered electronic regulation practical.
Original affiliation wording: Seiko Epson; Grand Seiko. No present-day employment or ownership inferred.
Other people linked to the same brands
- Kazunori Hoshino — Seiko Epson Corporation, Grand Seiko
- Osamu Takahashi — Seiko Epson Corporation, Grand Seiko
- Keisuke Kano — Seiko Epson Corporation
- Kiyoko Nakayama — Seiko Epson Corporation
- Takuma Kawauchiya — Grand Seiko
- Tokuichi Inagaki — Seiko Epson Corporation
Evidence and limitations
This dossier connects 6 field-specific evidence records with 1 public source. Known links only; full career not established
Claim qualifications (6)
- Noteworthy contribution: Circuit-design role is distinct from Akahane's original concept and Takahashi's development leadership; wider-team contributions retained. 1
- Representative work: Circuit-design role is distinct from Akahane's original concept and Takahashi's development leadership; wider-team contributions retained. 1
- Affiliations / workshops: Circuit-design role is distinct from Akahane's original concept and Takahashi's development leadership; wider-team contributions retained. 1
- Specific role: Circuit-design role is distinct from Akahane's original concept and Takahashi's development leadership; wider-team contributions retained. 1
- Primary geography: Circuit-design role is distinct from Akahane's original concept and Takahashi's development leadership; wider-team contributions retained. 1
- Geographic ties: Circuit-design role is distinct from Akahane's original concept and Takahashi's development leadership; wider-team contributions retained. 1
Sources
- Spring Drive. Born of a dream. Realized through innovation. — The story of Spring Drive, chapter 1Grand Seiko · First-party / official · Not stated
[S0213] Grand Seiko. "Spring Drive. Born of a dream. Realized through innovation. — The story of Spring Drive, chapter 1." Not stated. https://www.grand-seiko.com/au-en/special/dream9stories/vol1/1 Accessed 2026-09-13.
Source context
Relationship to subject: House or maker associated with subject
How it was checked: Page opened; relevant text read
Limitation: Manufacturer history with engineers' accounts. Collaborative development is explicit; no sole-inventor attribution.
Corrections and stronger evidence
Names, dates, and workshop relationships can change as archives are digitised. If you have a primary source that clarifies this record, use the correction process.
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