At a glance
- Period
- 20th–21st century
- Place
- Japan
The watchmaking story
A useful place to start with Hideo Tsuchiya's work is Man-nen Jimeisho replica. 1
Hideo Tsuchiya worked for or held a role at Seikosha. 1
Sources associate Hideo Tsuchiya with Man-nen Jimeisho research project, although the precise role remains unresolved. 1
Scope: Broader horology
Why this person is included
Documented major restoration project
Background and working context
Affiliations and workshops: Seikosha; Man-nen Jimeisho research project
Geographic ties: Japan. Documented workplace / industry location
Brands, workshops, and other relationships
- Movement / component supplier or manufacturer · Inherited source-linked record; relationship classification reviewed, sources not reopened
Seikosha — Worked for / held role. Horological researcher and restoration specialist 1
Legacy affiliation: Seikosha; Man-nen Jimeisho research project. Person-level contribution: Led the clock section of the national project investigating and replicating Tanaka's Man-nen Jimeisho.
Original affiliation wording: Seikosha; Man-nen Jimeisho research project. No present-day employment or ownership inferred.
- Horological project / collaboration · Inherited source-linked record; relationship classification reviewed, sources not reopened
Man-nen Jimeisho research project — Association — role unresolved. Horological researcher and restoration specialist 1
Legacy affiliation: Seikosha; Man-nen Jimeisho research project. Person-level contribution: Led the clock section of the national project investigating and replicating Tanaka's Man-nen Jimeisho.
Original affiliation wording: Seikosha; Man-nen Jimeisho research project. No present-day employment or ownership inferred.
Other people linked to the same brands
- Kintaro Hattori — Seiko
- Kosuke Fujita — Seiko
- Tsuruhiko Yoshikawa — Seiko
Evidence and limitations
This dossier connects 3 field-specific evidence records with 1 public source. Known links only; full career not established; unresolved relationship(s) remain
Claim qualifications (3)
- Noteworthy contribution: Clock-section leadership and replica drawings in a multi-institution project, not sole restoration authorship. Locator: Footnote 2 1
- Representative work: Clock-section leadership and replica drawings in a multi-institution project, not sole restoration authorship. Locator: Footnote 2 1
- Specific role: Clock-section leadership and replica drawings in a multi-institution project, not sole restoration authorship. Locator: Footnote 2 1
Sources
- Hisashige Tanaka (1799–1881)The Seiko Museum Ginza · Museum / archive · Not stated
[S0079] The Seiko Museum Ginza. "Hisashige Tanaka (1799–1881)." Not stated. https://museum.seiko.co.jp/en/knowledge/inventors_04/ Accessed 2026-09-13.
Source context
Relationship to subject: Museum / archive custodian
How it was checked: Opened and read
Limitation: Post-consolidation gap-resolution pass: Original source text inspected; not independent corroboration of every profile clause.
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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