MB&F’s iconic Legacy Machine now incorporates one of the most traditional complications in the mechanical watch making: the Perpetual Calendar. Equipped with a visually stunning in-house movement, this high horology timepiece was created in association with independent Irish watchmaker Stephen McDonnell.
Legacy Machine Perpetual launches with a limited edition of 25 pieces in 18K red gold and 25 pieces in platinum 950.
Fully integrated perpetual calendar developed for MB&F by Stephen McDonnell, featuring dial-side complication and mechanical processor system architecture with inbuilt safety mechanism. Manual winding with double mainspring barrels. Bespoke 14mm balance wheel with traditional regulating screws visible on top of the movement. Superlative hand finishing throughout respecting 19 th century style; internal bevel angles highlighting hand craft; polished bevels; Geneva waves; hand-made engravings.
Power reserve: 72 hours
Balance frequency: 18,000bph/ 2.5Hz
Number of components: 581
Number of jewels: 41
Hours, minutes, day, date, month, retrograde leap year and power reserve indicators
Material: launch editions in 18K5N+ red gold or platinum 950
Dimensions: 44 mm x 17.5 mm
Number of components: 69 components
Water resistance: 30 m / 90' / 3 atm
Sapphire crystals: Sapphire crystals on top and display back treated with anti-reflective coating on both faces
Black or dark brown hand-stitched alligator strap with gold / platinum folding buckle matching case material
'Friends' responsible for LM Perpetual
Concept: Maximilian Büsser / MB&F
Product design: Eric Giroud / Through the Looking Glass
Technical and production management: Serge Kriknoff / MB&F
Movement design and finish specifications: Stephen McDonnell and MB&F
Movement development:Stephen McDonnell and MB&F
R&D: Guillaume Thévenin and Ruben Martinez / MB&F
Wheels, pinions, movement component: Dominique Guye / DMP
Balance wheel bridge and plates: Benjamin Signoud / AMECAP
Balance wheel: Dominique Lauper / Precision Engineering
Balance spring: Stefan Schwab / Schwab-Feller
Bridges: Rodrigue Baume / Damatec,George Auer / Mecawatch
Perpetual calendar parts:Alain Pellet / Elefil
Movement component profile-turning: Yves Bandi / Bandi
Hand-engraving of movement: Sylvain Bettex / Glypto and Eddy Jaquet
Hand-finishing of movement components: Jacques-Adrien Rochat / C-L Rochat
PVD-treatment: Pierre-Albert Steinmann / Positive Coating
Movement assemblage: Didier Dumas, Georges Veisy, Anne Guiter, Florian Courbat and Emmanuel Maitre / MB&F
In-house machining: Alain Lemarchand / MB&F
After-Sales service: Florian Courbat / MB&F
Quality Control: Cyril Fallet / MB&F
Case : Pascal Queloz / Oréade
Dial: Maurizio Cervellieri / Natéber, Sébastien Paroz / Swissmec
Buckle: Dominique Mainier / G&F Chatelain
Crown and correctors: Jean-Pierre Cassard / Cheval Frères
Hands: Pierre Chillier, Isabelle Chillier and Félix Celetta / Fiedler
Sapphirecrystals: Martin Stettler / Stettler
Strap: Olivier Purnot / Camille Fournet
Presentation box: Olivier Berthon / ATS Atelier Luxe
Production logistics: David Lamy and Isabel Ortega / MB&F
Biography Stephen McDonnell
Stephen McDonnell was born in Belfast, Northern Ireland in 1972. He has been interested in watchmaking ever since he remembers, tinkering and "repairing" his grandfather's clocks as a precocious four-year-old. While growing up, McDonnell's passion − which he describes more as an addiction − never abated, however as watchmaking was not a particularly well-known career path in Northern Ireland, he always thought that it would remain a hobby while he worked in another field.
After completing a degree in theology at Oxford University, McDonnell returned to Belfast and gradually fell into repairing clocks for a number of watch and clock shops. This led to the realisation that watchmaking might well be a career after all. After completing a one-week Rolex course − until then his experience had been virtually exclusively with clocks − McDonnell moved to Neuchâtel, Switzerland in 2001 to do a six-month course at WOSTEP (Watchmakers of Switzerland Training and Educational Program). Upon completion, he was offered an instructor position at WOSTEP, which he held until 2007 when he decided to set up as an independent watchmaker.
McDonnell became an accomplished, though self-taught, movement designer, which provided him with a very rare skill set as watch constructors rarely have hands-on practical watch experience.
McDonnell moved back to Belfast with his wife and two children in 2014. He now works from his own comprehensively-equipped workshop, enabling him to make anything he needs for prototyping. An absolute horological perfectionist, McDonnell likes to control all aspects of the development process from conception through to 3D design, construction, the creation of technical plans, and prototyping.
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