L.Leroy – OSMIOR “Bal du Temps” Tourbillon Minute Repeater Edition

L.Leroy – OSMIOR “Bal du Temps” Tourbillon Minute Repeater Edition 2025

L.Leroy Celebrates 240 Years with the Launch of the Osmior BAL DU TEMPS at Geneva Watch Days 2025 

L.Leroy celebrates its 240th birthday this year, marking an important new chapter in its illustrious history. The Geneva Watch Days event will see the world premiere of a stunning new creation, representing the brand's return to the forefront of Haute Horlogerie: the L.Leroy Osmior 'Bal du Temps'. 

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Timepieces crafted by L.Leroy, the esteemed Maison that was established in Paris in 1785 by Charles Leroy, have spanned the centuries, bestowing their distinguished owners with unparalleled elegance and distinc tion.

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In 2025, the year of its 240th anniversary, L. Leroy is proud to continue to fascinate and mark the time of enthusiasts and discerning connoisseurs of fine mechanical watchmaking with a new and exceptional work of art equipped with prestigious complications.

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This latest novelty marks a new milestone in the perpetuation and evolution of the brand. Named Bal du Temps, it is part of the Osmior collection, characterised by classic aesthetic codes. It is a model that features complications of the highest technical level, such as the Tourbillon and the Minute Repeater, which will be produced in limited quantities and manufactured exclusively for L. Leroy in Geneva.

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This extraordinary masterpiece of fine craftsmanship and mechanical engineering will make its world premiere at the Geneva Watch Days event, where it will be on show at the Hotel Beau Rivage from 4 to 7 September 2025.

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These new creations are the beginning of a new era for L.Leroy, whose desire is to keep its glorious past alive while fully respecting the brand's DNA. Great attention is therefore paid to the aesthetic canons that define it, the exquisite finishes that enhance its fascinating beauty and the intricate mechanics with their impressive complications.

A refined and unmistakable aesthetics

The case: sinuous lines define its classic allure

The case is crafted from noble metals such as 18K 5N red gold and platinum, as well as a more modern material, grade 5 titanium, which is highly appreciated for its lightness. These three variants have a diameter of 43 mm and a height of 13.60 mm (including the domed sapphire crystal), which is a moderate thickness considering the movement's complications.

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With a polished surface and a “tambour” shape, a signature feature that immediately identifies the Osmior collection, it is distinguished by its flat, recessed case middle in relation to the bezel and the case back. The lugs are chamfered and slightly flared, with rounded ends. 

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The crown is engraved with the polished, interlaced double 'L' of the Maison's logo, which stands out against the sandblastedsurface. Grooved notches around the circumference facilitate the grip when winding the watch and setting the time. 

But the meticulous attention to detail does not stop here.

Various measures have also been taken with regard to the ring that secures the sapphire antireflective crystal to the rear of the watch. While the outer perimeter is flat, the inward-facing part has domed segments, interrupted by the positioning of the six fixing screws. 

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These portions have been created using the embossing method. Bordered by a polished profile and a sandblasted surface, they display polished relief engravings that define the watch's identity.

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The case of the Bal du Temps is water-resistant up to 3 atm and a black alligator strap with large scales and tone-on-tone stitching secures it to the wrist. The inner lining is also made of alligator leather, but with small scales. The exclusive design for the folding buckle, in materials matching the case, consists of the double “L” logo which is positioned inside the ring, thereby giving it an original style. 

The Dial: a delight for the eyes

The dial becomes the stage on which the play is performed. The title of the play is Bal du Temps, written and directed by L. Leroy.

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This sophisticated piece pays homage to its historical heritage and the tradition of Swiss high-end watchmaking, with every detail accurately designed to meet the highest standards of this art.

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The open worked dial is a veritable hymn to micro-mechanics, showcasing the intricate mechanics equipped with the prestigious Minute Repeater and Flying Tourbillon devices, the latter visible at 6 o'clock.

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Only highly qualified watchmakers can design and assemble these two complications to perfection, resulting in perfectly harmonious sounds and excellent chronometric precision.

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In addition, an intriguing detail immediately demands attention: the display features a single hand, that of the hour, while the minutes are indicated by an exquisite acoustic mechanism, known as the Minute Repeater, which is activated by a slide located at 9 o'clock. 

 

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A time reading that is not totally new for the Maison, which is inspired by the historic “a tact” watch made for Prince Emil Maximilian Leopold August of Hesse around 1810 and which has already been the subject of a recent timepiece produced by the brand.

L.Leroy is keeping this “fil rouge” alive!

The sunray-finished hour ring features Arabic numerals reminiscent of L. Leroy's historical pieces. Each case material adopts a different colour, endowing each watch in the collection with its own unique identity. 

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The palette ranges from silver on the titanium, providing a very discreet tone-on-tone effect, enlivened by the ALD-treated blue hand; light ALD-treated blue combined with precious platinum and a rhodium-plated hand; and anthracite grey, against which the gilded numerals and hour hand stand out on the 18K5N case version.

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At the centre of the dial, levers and gears move in perfect harmony to fulfil the mission for which they are intended. These components have been refined to perfection. A number of these elements are satin-finished, while others are polished. The plate is embellished with circular graining, and the screw heads are polished.

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Superbly crafted, the flying tourbillon cage at the 6 o'clock position completes a full rotation in one minute and is adorned with a bridge bearing the interlaced double “L”, the House's symbol. Made of shiny titanium, it has bevelled and polished profiles and is fixed by white gold screws and pillars.

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The combination of the many elements gives dynamism, depth, and a personality all its own to this masterpiece of time, which is offered in three variants. They showcase the exceptional expertise of the watchmakers and artisans while preserving the brand's heritage with an eye to the avant-garde spirit of the 21st century.

A valuable mechanics with great complications

At the heart of the new Bal du Temps lies the L601SQ calibre, featuring two of the most noble watchmaking complications: the Minute Repeater and the Tourbillon, which is a flying one in our model.

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The complications and some historical notes

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The earliest examples of the minute repeater — a sophisticated and complex mechanism representing the pinnacle of watchmaking artistry, earning it the nickname “the queen of complications” — date back to the 17th century. 

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During this period, two Englishmen, the Reverend Edward Barlow and the watchmaker Daniel Quare, laid the foundations of this invention, adopting slightly different approaches. The purpose of the minute repeater device was to convert time into sound on demand, which was necessary due to the difficulty of reading the dial in the dark before the advent of electricity.

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In 1783, the French watchmaker Abraham-Louis Breguet perfected this invention by replacing the initial bells with gongs. Initially rectilinear in shape and placed on the back plate, these springs later became circular and positioned around the movement. 

 

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An ingenious system that made it possible to reduce the thickness of the movement. There are usually two gongs, struck by as many hammers that acoustically strike the hours, quarters and minutes in different tones.

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Manufacturing and adjusting a minute repeater watch requires exceptional craftsmanship. To achieve a harmonious and distinct chiming sound, as well as amplify the resonance, the shape of the case and the chosen material both play a key role.

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Another masterpiece of watchmaking technology is the tourbillon device, which was invented and patented by Breguet in 1801. It is useful for nullifying the negative effects of gravity on timekeeping precision and consists of a visually striking mobile cage containing the entire regulating organ (balancewheel, escapement, and pallet fork), which rotates on itself in one minute to compensate for any time inaccuracies.

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In 1920, Alfred Helwig, a watchmaker from Glashütte (Germany), invented the flying tourbillon. This was an evolution of the traditional mechanism, favouring aesthetics by only attaching the cage to the underside and preventing the upper bridge from obscuring its beauty.

These two devices were selected to bring the extraordinary Bal du Temps to life, and demonstrate the masterful know-how that has set L. Leroy apart in the world of watchmaking for 240 years.

The L610SQ calibre

The high-performance engine that powers this remarkable piece is a hand-wound movement, the calibre L610SQ, made up of 321 parts, produced exclusively in Geneva. It beats at a frequency of 3 Hz (21,600 vibrations per hour) and is equipped with a unique barrel guaranteeing a power reserve of no less than 90 hours.

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It features a minute repeater mechanism on two gongs, which is activated on demand via the slide at the 9 o'clock position. Once activated, the time indication becomes audible. The hours, quarters and minutes are differentiated by distinct chimes, emitted when the two hammers strike the two gongs. 

 

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The hammers are beautifully displayed on the case back, in the positions that mark the hours from 10 to 12 o'clock on the dial. They boast exquisite finishing, with mirror polishing on the surface and anglage on the bevelled edges.

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The harmonious dance of the flying tourbillon cage, which performs a complete rotation in one minutethereby optimising the timekeeping precision, is a visual delight for the eye. Composed of 76 parts, it is embellished with the logo-shaped, polished titanium upper bridge.

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This complex movement, elegant in its architecture, features a refined single rhodium-plated bridge with bevelled and polished edges that contrast with the hand-finished frosted surface, enlivened by the touch of colour provided by the visible rubies.

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The Bal du Temps will be available from September 2025 in a few selected boutiques worldwide.

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This extraordinary timepiece is a true collector's item that invites connoisseurs and enthusiasts alike to experience this new chapter in L. Leroy's prestigious and ever-evolving history.

Notes

Osmior

“Osmior” is the name given to an old, special metal alloy, composed principally of gold with a colour that is close to platinum. It was regularly used by the company to produce the cases of its watches with “grandes complications”, and this made it a natural choice of name for the classic line in the L.Leroy collections. 

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The very essence of neoclassical watchmaking, the Osmior line perfectly encapsulates the elegance, refinement, discretion and absolute quality of the watches that we produce in very limited numbers.

Bal du Temps

In the gilded salons of the Hôtel de la Marine, time was not counted by clocks alone, but by the measured cadence of the dance. Each step, each gesture, was a mark in the rhythm of eternity — a dialogue between silence and music, presence and memory.

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The Bal du Temps, inspired by these grand soirées of Louis XVI’s court, captures this eternal interplay. Just as a minuet unfolds in three movements — delicate, graceful, and precise — the minute repeater within this creation resonates with three distinct chimes. Each note is a step in a choreography of sound, echoing the way dancers once traced patterns across polished parquet floors.

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To wear the Bal du Temps is to hold a fragment of that courtly rhythm upon the wrist: the pulsation of an age where time was lived as art. The watch becomes both stage and orchestra, where the passage of hours is not merely measured, but performed.

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At its heart lies the eternal paradox: Time — elusive, ungraspable, and yet made tangible by the mastery of the horloger. The Bal du Temps does not only indicate hours, quarters and minutes; it interprets them, giving voice to time through chimes, as dancers once gave it form through movement. Thus, L.Leroy invites you to step once more into the timeless dance of history — where rhythm, music, and memory converge in harmony.

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TECHNICAL SPECIFICATIONS   

Model:   OSMIOR “Bal du Temps” Red Gold

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 Reference: LL305/1

🔰Limited production

Case
    Material: Round, tambour shaped case in 18k 5N red gold
    Diameter: 43 mm
    Thickness: 13.80 mm with the domed sapphire crystal glass, 11.80 without the glass
    Polished domed bezel
    Repeater slide between 8:30 and 9:30
    Fluted crown with polished engraved logo on a sandblasted surface
    Polished case back ring with frosted segments and polished relief engravings
    Antireflective sapphi re crystal glass on dial and case back
    Water-resistant to 3 ATM (~30 meters)
Dial
    Anthracite hour track with sunray finish, L.Leroy Arabic numerals in gold decal, gold plated hour hand
    Tourbillon bridge with Leroy's interlaced letter L, polished finish
    Polished circlet framing the tourbillon cage
    Mainplate: circular graining finish
    Levers and gears with satin and polished finishes
Movement
    Proprietary manual winding movement, minute repeater, flying tourbillon, calibre L601SQ
    Number of components: 321
    Fitting diameter: 30mm
    Thickness: 8.89mm 9.91mm with the tourbillon cage
    Number of jewels: 29
    Frequency: 3 Hz, 21'600 vph
    Variable inertia balance wheel with flat balance spring
    Swiss lever escapement
    Single barrel
    Rhodium plated single bridge with frosted decoration, hand finished
    Power reserve of 90 hours
    Minute repeater on two gongs struck by two hammers: hours and quarters hammer on the right/ Minutes and quarters hammer on the left , visible on the case back, mirror polished hammers
    Screws: polished screw heads
Tourbillon cage
    Diameter: 13.60mm
    Number of parts: 76
    Complete rotation in 1 minute
    Polished, logo shaped titanium upper bridge with bevelled edges
Functions/Indications
    Hours indication by a single central hand
    Minute repeater on two gongs for audible hours, quarters and minutes indication
Strap and buckle
    Black alligator leather strap featuring large scales on the upper part and small scales on the inner lining with tone on tone stitching.
    Round shaped open worked folding clasp bearing the brand's interlaced double “L”, made from materials to match the case

🔴: Price upon request 

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TECHNICAL SPECIFICATIONS   

Model:    OSMIOR “Bal du Temps” Platinum

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Reference: LL306/1

🔰Limited production

Case
    Material: Round, tambour shaped case in 
    Diameter: 43 mm
    Thickness: 13.80 mm with the domed sapphire crystal glass, 11.80 without the glass
    Polished domed bezel
    Repeater slide between 8:30 and 9:30
    Fluted crown with polished engraved logo on a sandblasted surface
    Polished case back ring with frosted segments and polished relief engravings
    Antireflective sapphi re crystal glass on dial and case back
    Water-resistant to 3 ATM (~30 meters)
Dial
    Blue hour track obtained through ALD treatment with sunray finish, L.Leroy Arabic numerals in white decal, rhodium plated hour hand
    Tourbillon bridge with Leroy's interlaced letter L, polished finish
    Polished circlet framing the tourbillon cage
    Mainplate: circular graining finish
    Levers and gears with satin and polished finishes
Movement
    Proprietary manual winding movement, minute repeater, flying tourbillon, calibre L601SQ
    Number of components: 321
    Fitting diameter: 30mm
    Thickness: 8.89mm 9.91mm with the tourbillon cage
    Number of jewels: 29
    Frequency: 3 Hz, 21'600 vph
    Variable inertia balance wheel with flat balance spring
    Swiss lever escapement
    Single barrel
    Rhodium plated single bridge with frosted decoration, hand finished
    Power reserve of 90 hours
    Minute repeater on two gongs struck by two hammers: hours and quarters hammer on the right/ Minutes and quarters hammer on the left , visible on the case back, mirror polished hammers
    Screws: polished screw heads
Tourbillon cage
    Diameter: 13.60mm
    Number of parts: 76
    Complete rotation in 1 minute
    Polished, logo shaped titanium upper bridge with bevelled edges
Functions/Indications
    Hours indication by a single central hand
    Minute repeater on two gongs for audible hours, quarters and minutes indication
Strap and buckle
    Black alligator leather strap featuring large scales on the upper part and small scales on the inner lining with tone on tone stitching.
    Round shaped open worked folding clasp bearing the brand's interlaced double “L”, made from materials to match the case

🔴: Price upon request 

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TECHNICAL SPECIFICATIONS   

Model:  OSMIOR “Bal du Temps” Titanium

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Reference: LL307/1

🔰Limited production

Case
    Material: Round, tambour shaped case in titanium
    Diameter: 43 mm
    Thickness: 13.80 mm with the domed sapphire crystal glass, 11.80 without the glass
    Polished domed bezel
    Repeater slide between 8:30 and 9:30
    Fluted crown with polished engraved logo on a sandblasted surface
    Polished case back ring with frosted segments and polished relief engravings
    Antireflective sapphi re crystal glass on dial and case back
    Water-resistant to 3 ATM (~30 meters)
Dial
    Rhodium plated silver hour track with sunray finish L.Leroy Arabic numerals black decal, ALD treated blue hour hand
    Tourbillon bridge with Leroy's interlaced letter L, polished finish
    Polished circlet framing the tourbillon cage
    Mainplate: circular graining finish
    Levers and gears with satin and polished finishes
Movement
    Proprietary manual winding movement, minute repeater, flying tourbillon, calibre L601SQ
    Number of components: 321
    Fitting diameter: 30mm
    Thickness: 8.89mm 9.91mm with the tourbillon cage
    Number of jewels: 29
    Frequency: 3 Hz, 21'600 vph
    Variable inertia balance wheel with flat balance spring
    Swiss lever escapement
    Single barrel
    Rhodium plated single bridge with frosted decoration, hand finished
    Power reserve of 90 hours
    Minute repeater on two gongs struck by two hammers: hours and quarters hammer on the right/ Minutes and quarters hammer on the left , visible on the case back, mirror polished hammers
    Screws: polished screw heads
Tourbillon cage
    Diameter: 13.60mm
    Number of parts: 76
    Complete rotation in 1 minute
    Polished, logo shaped titanium upper bridge with bevelled edges
Functions/Indications
    Hours indication by a single central hand
    Minute repeater on two gongs for audible hours, quarters and minutes indication
Strap 
    Black alligator leather strap featuring large scales on the upper part and small scales on the inner lining with tone on tone stitching.
    Round shaped open worked folding clasp bearing the brand's interlaced double “L”, made from materials to match the case

🔴: Price upon request 

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L.LEROY S.A. BUBENBERG-STRASSE 7, 
2502 BIEL/BIENNE – SWITZERLAND - CHE-103.246.845
Press Office: Angela Landone – landone@landonerp.com 
– Ph. +39 338 3252455
www.montres-leroy.com 
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