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Watchmaker profile

Stephen McDonnell

Stephen McDonnell developed MB&F's integrated perpetual-calendar movement with its mechanical-processor architecture and safety system. 1

Source calls him Irish; this row does not assert citizenship or present workshop location.

At a glance

The watchmaking story

A useful place to start with Stephen McDonnell's work is Legacy Machine Perpetual. 1

Stephen McDonnell Watches is the name recorded for Stephen McDonnell's own watchmaking practice. 1

Stephen McDonnell designed, developed or supplied work for MB&F. 1

Scope: Direct watchmaking

Why this person is included

Documented original work

Background and working context

Affiliations and workshops: Stephen McDonnell Watches; MB&F

Documented origin: Ireland (source description)

Geographic ties: Ireland; Switzerland. Location of documented watchmaking collaboration

Brands, workshops, and other relationships

  1. Watch brand / watchmaking business · Inherited source-linked record; relationship classification reviewed, sources not reopened

    Stephen McDonnell Watches — Own watchmaking practice. Independent movement constructor 1

    Legacy affiliation: Stephen McDonnell Watches; MB&F. Person-level contribution: Developed MB&F's integrated perpetual-calendar movement with its mechanical-processor architecture and safety system.

    Original affiliation wording: Stephen McDonnell Watches; MB&F. No present-day employment or ownership inferred.

  2. Watch brand / watchmaking business · Inherited source-linked record; relationship classification reviewed, sources not reopened

    MB&F — Designed / developed / supplied for. Independent movement constructor 1

    Legacy affiliation: Stephen McDonnell Watches; MB&F. Person-level contribution: Developed MB&F's integrated perpetual-calendar movement with its mechanical-processor architecture and safety system.

    Original affiliation wording: Stephen McDonnell Watches; MB&F. No present-day employment or ownership inferred.

Evidence and limitations

This dossier connects 3 field-specific evidence records with 1 public source. Known links only; full career not established

Claim qualifications (3)
  • Noteworthy contribution: Model-specific collaboration attribution; marketing first/best claims excluded. 1
  • Representative work: Model-specific collaboration attribution; marketing first/best claims excluded. 1
  • Specific role: Model-specific collaboration attribution; marketing first/best claims excluded. 1

Sources

  1. Legacy Machine PerpetualMB&F · First-party / official · Not stated

    [S0116] MB&F. "Legacy Machine Perpetual." Not stated. https://www.mbandf.com/machines/mbf-machines/legacy-machines/lm-perpetual Accessed 2026-09-13.

    Source context

    Relationship to subject: Subject / successor organization

    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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