ARNOLD & SON – Constant Force Tourbillon 11 Yellow Gold Edition

ARNOLD & SON – CHRONOMETRY Constant Force Tourbillon 11 Yellow Gold Edition - 2025

A CELEBRATION OF WATCHMAKING
INGENUITY

The 41.5 mm diameter Constant Force Tourbillon 11 watch in 18-carat yellow gold, released by Arnold & Son as a limited edition of 11, is driven by a hand-wound mechanical movement. Equipped with two barrels to give a 100-hour power reserve, this timepiece was entirely developed and built at the manufacture in La Chaux-de-Fonds. It is fitted with a constant force mechanism visible on the enamel dial and is regulated by a tourbillon that can be seen on the back. 

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The architecture of this calibre is inspired by that of the timekeeping instrument driven by the first tourbillon created by Abraham-Louis Breguet in 1808, based on a chronometer movement designed by John Arnold. This first tourbillon regulator, now in the British Museum, was given to John Roger Arnold by the Paris-based watchmaker in honour of his scientific collaboration and friendship with his father. The Constant Force Tourbillon 11 timepiece, designed to mark the end of the 260th anniversary celebrations of John Arnold’s legacy, pays tribute to the watchmaker’s ingenuity and his close association with Abraham-Louis Breguet.

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John Arnold and A.-L. Breguet, silver cased chronometer with tourbillon and spring-detent escapement, London, England, 1774 and Paris, France, 1808
© The Trustees of the British Museum

The greatest watchmakers of the Age of Enlightenment often knew each other. Some of them exchanged views and appreciated each other despite language barriers and political obstacles. And this was the case with John Arnold and Abraham-Louis Breguet. These two watchmakers, undoubtedly the most productive of the second half of the 18th century, forged a friendship that nothing could shake, not even the throes of war between the two countries or the French Revolution. Aware of their respective talents, during Abraham-Louis Breguet’s frequent trips to London between 1789 and 1791, they shared their views and knowledge of the principles of timekeeping, furthering the science of timekeeping, which in their eyes definitely knew no frontiers.

When context is everything

While John Arnold was captivated by the understated design of Abraham-Louis Breguet’s watches and his understanding of complex kinematics, Abraham-Louis Breguet was fascinated by his English friend’s ability to invent simple mechanisms that could be mass-produced and approached a chronometric precision that no other watchmaker of the time could hope to achieve. During their exchanges, which included sending their respective sons to train with the other, these two geniuses were able to work out the best way of eliminating the running errors of watch balances.

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The English watchmaker concentrated on optimising his detent escapement and developing balances, such as special springs, so as to offer instruments capable of satisfying his proto-industrial approach to chronometer construction – especially as the Admiralty asked him to produce them in ever greater quantities and at ever lower prices.

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Meanwhile, Abraham-Louis Breguet, inspired by his conversations with his English friend on the principles of high chronometry, continued to work on developing the tourbillon during his exile in Switzerland from 1792. On his return to Paris in 1795, he wrote about the development of a rotating carriage in a letter. Then, two years after John Arnold’s death in 1799, he patented this mechanism under the name ‘tourbillon’ in Paris on 26 June 1801, i.e. 7 Messidor Year IX according to the French Republican calendar still in effect at the time.

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To honour the memory of his friend and remember the research they had carried out together, he based his first tourbillon regulator on the movement of John Arnold’s marine chronometer no. 11. He screwed an engraved silver plate onto the main bridge with the following dedication: “The first tourbillon regulator by Breguet incorporated in one of the first works of Arnold. Breguet's homage to the revered memory of Arnold. Presented to his son in the year 1808.” This timekeeping instrument, now in the British Museum, was given to John Roger Arnold, who succeeded his father as head of the workshop and London boutique.

A chronometer designed to tell a story

As a tribute to their work and in memory of the friendship between these two watchmaking geniuses during the Age of Enlightenment, Arnold & Son has chosen to give this Constant Force Tourbillon 11 watch a 41.5 mm diameter 18-carat yellow gold case with a classic design. The yellow hue of this precious metal was chosen because it was often used by John Arnold for prestigious pocket watches at the time. It is in perfect harmony with the openworked bridge of the constant force mechanism, which is also made of 18-carat yellow gold. 

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The timepiece’s curved case middle helps to reduce its profile. The front features a thin bezel set with a slightly domed sapphire crystal with an anti-reflective coating on both sides. On the reverse, it has an open case back in yellow gold with an identical sapphire crystal, revealing the manual winding manufacture calibre with the reference A&S5219. Water-resistant up to a pressure of 3 bar (30 metres or 100 feet), the watch is worn on an alligator leather strap fastened around the wrist with a classic pin buckle in 18-carat yellow gold bearing the Arnold & Son monogram.

A precious and captivating dial

For the Constant Force Tourbillon 11 timepiece, Arnold & Son chose a white Grand Feu enamel dial to recall the dials of the ship’s chronometers that John Arnold offered to English naval officers in his London boutique. This disc was individually produced by a specialist artisan on an 18-carat yellow gold base. White enamel is obtained by melting powdered materials in a kiln heated to just over 800°C. After firing the enamel several times to achieve the required thickness, the surface is lapped to make it smooth and even. 

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Then, as long as the material has not cracked and there are no imperfections that would spoil the white colour, a translucent enamel is applied and the disc is fired one last time. This gives it depth and transparency, bringing out the full magic of the enamel, whose hue is permanent and is called ‘Grand Feu’ (great fire) because it is vitrified by melting. Openings are then made in this delicate and precious disc to accommodate the constant force mechanism and white opal subdial – a true signature of the House. Here, for the first time at Arnold & Son, this fine stone has been recessed to give it a stronger visual presence and an angle that enhances the readability of the black transfer Roman numerals.

A calibre worthy of the master of chronometers

The A&S5219 movement was specially developed by the Manufacture’s engineers and watchmakers to the specifications of the Constant Force Tourbillon 11 watch. To remain as faithful to the original movement as possible, this calibre is hand-wound. 

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But while inspired by the past, it remains thoroughly contemporary. It is equipped with two identical barrels mounted in series, giving a 100-hour power reserve. These barrels alternate in driving the mechanism, the second being activated when the torque of the first falls below optimum output.

A constant force mechanism

To guarantee the isochronism of the regulating group over 100 hours of operation, the movement’s designers incorporated a patented constant force mechanism between the going train and the tourbillon. Visible on the dial side, its purpose is to smooth out the energy delivered by the barrels so as to prevent excessive or insufficient torque from affecting the oscillations of the balance in the tourbillon carriage. 

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This constant force mechanism is held in place by an 18-carat yellow gold bridge and rotates over the course of one minute. In the Constant Force Tourbillon 11, it replaces the fusee-and-chain configuration used by John Arnold in his chronometers. As well as supplying a constant force, the system chosen for this timepiece also allows for a ‘dead-beat seconds’ indication, in which the direct-drive hand does not advance seamlessly, but instead makes successive jumps of exactly one second – much like the direct-drive seconds of marine chronometers, which also made very similar jumps (detent chronometers generally beat every half-second). 

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In the configuration chosen for the Constant Force Tourbillon 11 watch, the seconds are not indicated by a conventional hand, but instead by the tip of a flame-blued anchor used as a structural bridge for the constant force mechanism.

A system intended to smooth out positional errors

Designed to celebrate the friendship between John Arnold and Abraham-Louis Breguet, the Constant Force Tourbillon 11 watch has a transparent anti-reflective sapphire crystal case back that showcases the architecture of the A&S5219 calibre, inspired by the back of the timekeeper kept in the British Museum. 

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Here, the tourbillon carriage, which rotates once every minute, keeps the general design of the carriage used by John Arnold’s brilliant friend in the timepiece intended to commemorate their unbreakable friendship and embody the true scope of their joint research. 

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The extremely refined tourbillon features a very thin, polished and rounded-off linear carriage bridge that reveals a variable inertia balance with inertia blocks inspired by the most sophisticated oscillators used in John Arnold’s chronometers. 

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The House also chose to incorporate a T-shaped retaining spring inspired by the one used in the ‘pare-chute’ shock protection system developed by Abraham-Louis Breguet and which can be found on the tourbillon bridge of the original instrument. However, a Swiss lever escapement, which is more practical and less sensitive to shocks, was chosen over the detent escapement of the original timepiece.

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The finishes of the mainplate, bridge and tourbillon cock are virtually identical on both timepieces, while the grained and chamfered barrel bridge of the Constant Force Tourbillon 11 watch features hand-engraved inscriptions and the famous plate, which has a new text inspired by the original: “To the revered memory of John Arnold and Abraham-Louis Breguet. Friends in their time, legendary watchmakers always.” . These words underscore the historical and horological context of this Arnold & Son edition of 11 timepieces, where friendship and the art of timekeeping were the strongest driving forces. 

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TECHNICAL SPECIFICATIONS

Collection:  CHRONOMETRY

Model: CHRONOMETRY Constant Force Tourbillon 11 Yellow Gold Edition

Reference 1FCBJ.E01A.C246J

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Movement
Calibre     A&S5219 hand-wound mechanical movement, constant force, one-minute tourbillon
Jewels    35
Diameter    33 mm
Thickness    10.48 mm
Power reserve    100 hours
Frequency    3 Hz / 21,600 vph
Finishes    
mainplate: 3N golden finish, grained, polished angles
    barrel bridge: 3N golden finish, grained, polished angles, stretched edges, hand-engraved
    tourbillon bridge: golden finish, grained, polished angles, stretched edges, satin-finished Durnico steel retaining spring     
     screws: blued, chamfered, mirror-polished heads    
    tourbillon: mirror-polished carriage plate, satin-finished pallet bridge, mirror-polished stud-holder, rhodium-finished balance, polished and rounded-off carriage bridge
     constant force bridge: 18-carat yellow gold (3N), polished bevel, satin-finished flat surface, polished angles
    constant force carriage lower bridge: flame-blued, mirror-polished, polished angles
Engraved plate    To the revered memory of John Arnold and Abraham-Louis Breguet. Friends in their time, legendary watchmakers always. 
Functions    hours, minutes, true-beat seconds
Dial    white Grand Feu enamel, 18-carat yellow gold (3N) base
Hour dial    white opal, concave
Case
Material    18-carat yellow gold (3N)
Diameter    41.5 mm
Depth    13.7 mm
Crystal    domed sapphire, anti-reflective coating on both sides
Case back    sapphire crystal, anti-reflective coating on both sides
Water-resistance    3 bar (30 metres/100 feet)
Strap
Material    midnight blue alligator leather with black alligator leather lining
Buckle    pin buckle, 18-carat yellow gold (3N)

🔰Edition -✅only ❱❱❱ 11 timepieces
🔴Swiss retail price CHF 129,800 excl. tax (subject to change)💰

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ARNOLD & SON – CHRONOMETRY HM Steel Amber Edition

ARNOLD & SON – CHRONOMETRY HM Steel Amber Chronometer Edition - 2025

HM STEEL AMBER
ANCIENT AND ALIVE

The beauty of many millennia of fossilisation. The fiery shades of conifers in autumn. The radiant translucency of resin. Baltic amber reveals the richness of life, the complexity of nature and the magic of the passing of time. This rare and challenging fossilised resin is showcased in all its splendour on HM Steel Amber. It adorns the almost bare dial, framed by an ultra-thin steel case. Arnold & Son plays a new hand and continues to innovate in the field of exceptional materials.

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Arnold & Son is opening a new chapter in its collections of materials. After timepieces featuring charoite, specular hematite and even meteorite, a one-off piece from the Double Tourbillon collection played host to the glistening pale yellow hues of Baltic amber for the very first time. Difficult to source and challenging to work, it took the house several months to find the precious fossil needed to produce the 38 HM Steel Amber timepieces.

BY CHANCE

The house settled on a block weighing 1.6 kilograms, fossilised more than 30 million years ago. Not only is this amber rare, but there is a risk associated with any nodule, as it is impossible to know the quality of the contents in advance. The material may not have been suitable for making the dial.

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Cylinders were extracted from the block, cut and then inspected one at a time. The imperfect bases were rejected, as were the most fragile portions. Only high-quality specimens that met the criteria for solidity and appearance were kept. Amber’s visual characteristics are one of its unique assets: no two pieces have exactly the same pattern of streaks. The combination of colours is even more refined, with the hue of the amber reflecting and subtly blending with an ‘imperial green’ alligator leather strap.

RARE

Baltic amber is a little-known material in watchmaking. Formed by thousands of years of fossilisation of conifer resin, it is light, almost laminated, fragile yet resilient. The colour changes on contact with air and light, bordering on a brownish red at the surface. The heart, meanwhile, is a pale yellow, and it is this distinctive shade that has been selected by Arnold & Son.

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The HM Steel Amber dial takes up all the space. As it has no complications, the timepiece is simply drilled in the centre to accommodate the hour and minute hands that give it its name. 

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The HM collection has a special place in the Arnold & Son catalogue. Only used on an exceptional basis, this edition takes it in a new direction. The house has given it a very thin steel case with a diameter of 39.5 mm.

BEAUTIFULLY CONSTRUCTED

To echo the density of the dial, Arnold & Son chose one of its most iconic movements. The A&S1001 calibre, like all the house’s movements, is entirely developed, produced, decorated, assembled, adjusted and cased up by the manufacture in La Chaux-de-Fonds.

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This calibre presents an ultra-thin architecture, with a total thickness limited to 2.7 mm, allowing for a case that is just 7.82 mm deep. Combined with an oscillation frequency of 3 Hz, it offers a remarkable 90 hours of autonomy.

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 The case-back side of the A&S1001 calibre is also decorated in its entirety. Its surface is adorned with radiating Côtes de Genève stripes that emanate from the balance staff: the nerve centre of the movement. Finally, the corners are lowered and polished, contrasting with the entirely circular-grained mainplate underneath.

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TECHNICAL SPECIFICATIONS

Collection:  CHRONOMETRY

Model: CHRONOMETRY HM Steel Amber Edition

Reference 1LCDS.Z01A.C287S

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Case
    Material: Stainless steel
    Diameter: 39.50 mm
    Thickness: 7.82 mm
    Crystal domed sapphire, double-sided anti-reflective coating
    Case back sapphire crystal, anti-reflective coating
    Water-resistance 3 bar (30 m /100 feet)
Dial
    Baltic amber
    Blued hands
Movement
    Calibre A&S1001, hand-wound mechanical
    Diameter: 30 mm
    Thickness: 2.70 mm
    Number of jewels: 21
    Frequency: 21,600 vph (3 Hz)
    Power reserve of 90hours. 
Finishes
mainplate: rhodium-plated and circular-grained
bridges: chamfered, radiating Côtes de Genève stripes
wheels: snailed
screws: blued and chamfered, polished heads
Functions
    Hours, minutes
Strap and buckle
    Imperial-green alligator leather, papaya-yellow alligator leather lining
    Buckle: pin buckle, stainless steel

🔰Edition -✅only ❱❱❱ 38 timepieces

🔴Swiss retail price CHF 19,500 excl. tax (subject to change)💰

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ARNOLD & SON – PERPETUAL MOON 41,5 Red Gold “Year of the Snake” Edition

 

ARNOLD & SON – Astronomy PERPETUAL MOON 41,5 Red Gold “Year of the Snake” Edition 2025

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A CHARMING SNAKE

According to the traditional Chinese calendar, 2025 is the Year of the Wooden Snake and will be ruled by the words perspicacity, intelligence and prudence. In its honour, Arnold & Son is creating Perpetual Moon 41.5 “Year of the Snake”: a series of eight timepieces in red gold. Combining a manufacture calibre with a large astronomical moon – one of its specialities – with an aventurine glass dial base – one of its signatures – and a wealth of delicately worked artistic crafts – one of its recurring themes – Arnold & Son presents a masterful interpretation of the Year of the Snake.

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The Year of the Wooden Snake starts on 29 January 2025. Under this element, the reptile foretells transformation and a need for self-improvement, combined with energy and introspection. It is a year of negotiations, shrouded in mystery and secrecy. Arnold & Son is celebrating the Chinese zodiac calendar with Perpetual Moon 41.5 “Year of the Snake”.

Prudence

In the inimitable tradition of Arnold & Son’s decorative horology, this year is dedicated to a new “Chinese calendar” limited edition in the Perpetual Moon collection. 

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The dial of the timepiece centres on an undulating snake. It faces the observer, wrapped around the branch of a tree that offers innumerable benefits: Ginkgo biloba. The animal looks on calmly, nestled peacefully in a nocturnal setting.

Finesse

The snake is delicately hand-engraved into a block of 18-carat rose gold and set against a blue aventurine glass dial. Its fine scales, forked tongue and broad, flat head are depicted with realism. The large, mother-of-pearl moon, also rendered realistically with its shadows, is overlaid with Super-LumiNova. It illuminates an aventurine glass sky and is surrounded by the constellations of Ursa Major and Cassiopeia, which are also painted with luminescent material.

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The choice of these star patterns is a direct allusion to the history of marine chronometer-maker John Arnold. They have served as guiding lights since the dawn of time. Midway between them lies the Pole Star, which unerringly indicates the north. Here, the importance of the stars in determining periods, thresholds and symbols in the Chinese zodiac calendar forms a unique point of cultural and graphic convergence.

Excellence

On the case back, a secondary display of the phases of the moon allows fast and accurate adjustment of the complication. The manually-wound calibre that powers Perpetual Moon 41.5 Red Gold “Year of the Snake” is able to track the age of the moon with exceptional accuracy. The total duration of a lunar cycle is 29 days, 12 hours, 44 minutes and 2.8 seconds. Arnold & Son has approached this so closely that it would take 122 years for this movement, if constantly wound up, to accumulate a 24-hour discrepancy between the display and astronomical reality.

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Like all Arnold & Son’s movements, the A&S1512 calibre was entirely developed, produced, decorated, assembled, adjusted and cased up at the manufacture in La Chaux-de-Fonds. This calibre uses two barrels and has an oscillation frequency of 3 Hz, giving a 90-hour power reserve.

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TECHNICAL SPECIFICATIONS

Collection:  PERPETUAL MOON

Model:  PERPETUAL MOON 41.5 Red Gold “Year of the Snake” Edition

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Reference 1GBLR.Z09A.C264A

Movement
    Calibre A&S1512, hand-wound mechanical
    Jewels: 27
    Diameter:34 mm
    Depth: 5.35 mm
    Power reserve: 90 hours
    Frequency: 3 Hz / 21,600 vibrations/h
    Finishes
            main plate: rhodium-finished, Côtes de Genève stripes radiating from the centre
            bridges: polished and chamfered
            wheels: circular satin-finished
            screws: blued and chamfered, polished heads
            second moon-phase indication: rhodium-finished and circular-grained

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 Functions
    hours, minutes, astronomical moon phases,
    second indicator of moon phases on the case back
Dial 
Blue aventurine glass
Snake:
    18-carat rose gold (4N), hand-engraved and polished finishes
Landscape:
    Hand-painted with rose gold powder, overlaid with Super LumiNova
Sky:
    Blue aventurine glass
Constellations:
    Hand painted, overlaid with Super-LumiNova
Moon:
    Mother-of-pearl disc with hand-painted details overlaid with Super-LumiNova
Case
Vaterial: 18K red gold 5N
    Diameter: 41,5 mm
    Depth: 11.67 mm
    Crystal: domed sapphire with an anti-reflective coating on both sides
    Case back: sapphire with an anti-reflective coating on the interior
    Water-resistance: 30 m /100 ft
Strap & Buckle
Material: ink blue alligator leather, red alligator leather lining, hand-stitched

Buckle:  pin buckle, 18K red gold (5N)

     

🔰Edition
Limited edition of 8 timepieces

🔴Swiss retail price CHF 57,200 excl. tax (subject to change)💰

#ARNOLDandSON; #PERPETUALMOON; #CalibreA&S1512; #A&S1512; #EclipseI; #YearOfTheSnake; #MoonPhases; #AstronomicalMoon #SnakeDial

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Press releases - 2025
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ARNOLD & SON – Perpetual Moon 41.5 Platinum Fern Green Edition

 

ARNOLD & SON – PERPETUAL MOON 41,5 Platinum “Fern Green” Edition 2024

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 The watch features a 41.5 mm platinum case that exudes opulence and durability. The dial flaunts a unique “Fern Green” colour, inspired by the lush greenery of the ferns that thrive in the English gardens of Cornwall, where John Arnold, the founder, was born. This deep botanical hue projects a serene yet refreshing facade, reminiscent of tranquil moonlit landscapes.

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The dial’s “Stellar Rays” finish employs irregular engravings to produce a shimmering effect, showcasing an intricate play of light as the wearer moves. Multiple layers of transparent lacquer add depth, enhancing this visual spectacle. The grained sky on the dial is treated with a midnight blue PVD finish, enveloping viewers into a serene celestial experience.

Moon Phase Complication

The Perpetual Moon complication stands out, depicted on a large, white mother-of-pearl disc. This feature is set amidst a starry background showcasing the Ursa Major and Cassiopeia constellations. 

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Both the constellations and the moon are hand-painted and enhanced with Super-LumiNova, which remains invisible during the day but glows brightly at night, presenting a captivating nocturnal display.

Technical Mastery

Powering this watch is the manually-wound A&S1512 calibre, meticulously developed, decorated, and assembled at Arnold & Son’s manufacture in La Chaux-de-Fonds. 

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This calibre boasts a 90-hour power reserve, thanks to its dual barrel system, and operates at a frequency of 3 Hz. It offers exceptional precision in tracking the lunar cycle, accurate enough to require adjustment only once every 122 years.

Additional Features

On the reverse side, the case back features a secondary moon phase indicator along with a sapphire crystal that has an anti-reflective coating, enabling quick and precise adjustments. The watch’s resistance to water extends up to 3 bar, equivalent to 30 meters or around 100 feet.

Strap and Finishing Touches

This timepiece is adorned with a luxurious strap made of Cornwall green alligator leather, with a contrasting crimson-purple alligator leather lining. The strap connects securely with a platinum pin buckle. The watch measures 11.30 mm in depth, promising a comfortable fit on the wrist.

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The Perpetual Moon 41.5 Platinum, Fern Green edition, comes as a limited series of just 28 pieces, with each piece reflecting Arnold & Son’s commitment to craftsmanship and innovative watchmaking. 

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This rare piece is valued at a Swiss retail price of CHF 46,700, which includes VAT and is subject to change. The watch is not only a statement of elegance and sophistication but also serves as a remarkable tribute to the perpetual beauty of the moon and stars.

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TECHNICAL SPECIFICATIONS

Collection:  PERPETUAL MOON

Model:  PERPETUAL MOON 41.5 Platinum “Fern Green” Edition

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Reference 1GLBX.F01A.C285X


Movement
    Calibre A&S1512, hand-wound mechanical
    Jewels: 27
    Diameter:34 mm
    Depth: 5.35 mm
    Power reserve: 90 hours
    Frequency: 3 Hz / 21,600 vibrations/h
    Finishes
            main plate: rhodium-finished, Côtes de Genève stripes radiating from the centre
            bridges: polished and chamfered
            wheels: circular satin-finished
            screws: blued and chamfered, polished heads
            second moon-phase indication: rhodium-finished and circular-grained

 Click, to see the large size. ▶ BIG FOTO      

 Functions
    Hours, minutes,
    moon-phase indication,
    second moon-phase indication on the back
Dial 
Green “Stellar Rays” décor, with celestial-blue PVD treatment
Moon phases    sky: grained, with midnight-blue PVD treatment
    constellations: hand-painted, enhanced with Super-LumiNova
    moons: mother-of-pearl discs enhanced with Super-LumiNova, hand-painted details
Case
Vaterial: platinum (Pt 950)
    Diameter: 41,5 mm
    Depth: 11.30 mm
    Crystal: domed sapphire with an anti-reflective coating on both sides
    Case back: sapphire with an anti-reflective coating on the interior
    Water-resistance: 30 m /100 ft
Strap & Buckle
Material: Green alligator-skin with glittering specks, red alligator-skin lining, platinum (Pt950) thread, hand-sewn
Pin buckle, 18 carat white gold       

🔰Edition
Limited edition of 28 timepieces

🔴Swiss retail price CHF 46,700 excl. tax (may be subject to modifications)💰

#ARNOLDandSON; #PERPETUALMOON; #CalibreA&S1512; #A&S1512; #EclipseI; #Platinum; #MoonPhases; #AstronomicalMoon

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Press releases - 2024
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Marketing & Sales
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CH – 2300 La Chaux-de-Fonds
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