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Calibre L-901 Spotlight The Geneva Atelier Master Complications Poinçon de Genève Chronometer Specifications Collector Inscription FAQ
ATELIER GENÈVE 1204
Poinçon de Genève Certified · Limited Series of 12

Hand-Finished Calibres.
Timeless Complication.

Crafted in limited annual series in our Geneva atelier. Hand-chamfered bridges, vitreous grand feu enamel dials, and a flying tourbillon oscillating at 21,600 vibrations per hour.

Explore Complications
12
Pieces Built Annually
380h
Hand-Chamfering Per Movement
CHF 148,000
Retail Allocation Value
Master Watch Movement Macro

Calibre L-901 Flying Tourbillon

Twin-Barrel · Grand Feu Enamel · Platinum 950 Case

Master Watchmaker at Bench in Geneva Atelier
Geneva Atelier N° 42
Rue du Rhône · Founded 1984
Atelier Heritage & Craft

Preserving 400 Years of Swiss Horological Sovereignty.

In an era of industrial CNC automation, Lumière remains fiercely artisanal. Every pinion is burnished by hand using gentian wood pegs sourced from the Jura mountains. Every screw head receives black mirror polishing on a zinc plate.

Our master horologist, Jean-Luc Veyrat, limits the output of Calibre L-901 to one timepiece per calendar month, ensuring that each client receives an authentic piece of living art.

The Geneva Seal Standard
Technical Mastery

Interactive Complication Deep-Dive

Select any aspect of Calibre L-901 below to inspect the microscopic hand-finishing and mechanical architecture.

Complication 01

One-Minute Flying Tourbillon Cage

Weighing merely 0.28 grams, the titanium carriage floats without an upper supporting bridge, allowing an unobstructed view of the free-sprung variable-inertia balance wheel and Breguet overcoil.

  • Titanium grade 5 cage hand-polished with diamond paste
  • Variable inertia balance with 4 gold regulating weights
  • Escapement wheel in treated silicon ensuring frictionless impulse

60-Second Rotation Cycle

Zero gravity rate variation compensated in all vertical positions

Authentic Horology

The Poinçon de Genève Standard

Administered under statutory law of the Republic and Canton of Geneva since 1886. Only movements meeting all 12 criteria receive the official hallmark.

Hand-Chamfered Bridges

All bridge edges are cut with 45° internal angles (anglage rentrant) and mirror-finished using diamond abrasive paste.

Pivots & Pinions Burnished

Pinion leaves and arbor pivots are burnished to an ultra-low surface roughness under 0.05 microns to ensure zero mechanical friction.

Chronometric Accuracy

Tested across 5 static positions and 3 temperatures over 1,000 consecutive hours. Maximum deviation strictly under -1/+2 seconds per day.

Manufacture Calibre L-901

Manufacture Technical Dossier

Every timepiece is tested for 1,000 consecutive hours under the strict protocols of the Poinçon de Genève.

Movement Diameter

32.4 mm · 211 Components

Power Reserve

120 Hours (Dual Mainsprings)

Jewels

27 Rubies in Gold Chatons

Frequency

21,600 VPH (3 Hertz)

Case Material

Platinum 950 or 18k Rose Gold

Water Resistance

30 Metres (3 ATM Tested)

Provenance & Voices

Collector Testimonials

Words from custodians of Calibre L-901 across the world’s leading horological private collections.

“The interior angles of the tourbillon bridge rival the golden age of Philippe Dufour. There is simply no finer hand anglage produced in Switzerland today.”

Collector Portrait
Dr. Henri de Montmirail
Collector · Geneva, Switzerland

“To receive piece N° 04 of 12 was an unforgettable experience. Meeting Jean-Luc Veyrat at the Rue du Rhône atelier cements the emotional weight of this complication.”

Collector Portrait
Marcus Sterling, OBE
Patron & Philanthropist · London, UK

“The grand feu noir dial exhibits an impossible vitreous depth. In direct sunlight, the flying tourbillon cage appears to float in infinite cosmos.”

Collector Portrait
Kenji Takahashi
Horology Curator · Tokyo, Japan
Private Inquiries

Frequently Asked Questions

Clear guidance regarding allocations, provenance authentication, and atelier appointments.

Each application is personally reviewed by master horologist Jean-Luc Veyrat. Priority is accorded to existing independent horology patrons and collectors committed to long-term custodial stewardship.
Yes. Each collector may request bespoke grand feu enamel hues (Blanc Pur, Noir Profond, or Bleu Nuit) and case engravings. Bespoke orders involve a personal consultation at our Rue du Rhône atelier.
Every Calibre L-901 includes a 10-year comprehensive manufacture warranty. Routine service is performed exclusively in Geneva every 5 years, with complimentary insured courier transit worldwide.
Yes. Each piece is issued with an official embossed ledger certificate from the Canton of Geneva bearing the unique serial and chronometric rate archive, which transfers with ownership.
Limited Series Production

Secure Your Calibre L-901 Allocation

Annual production is strictly capped at 12 timepieces. Submit your collector credentials to begin private consultation.