BREGUET – Expérimentale No. 1 Constant-Force Magnetic 10 Hz Tourbillon 43.5mm Gold 250th Anniversary Edition - 2025
The first chapter in the brand’s new exploratory R&D line
Manufacture Breguet announces the creation of a line that will incorporate the latest innovations from its Research and Development department. Named “Expérimentale”, it is initially being introduced through a Marine wristwatch featuring an innovative and daring design. This timepiece crafted in Breguet gold is equipped with the very first high-frequency (10 Hz) tourbillon with a magnetic escapement and delivering constant force to the balance. It is certified by the Breguet hallmark.
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R&D have been core to numerous Breguet creations for 250 years. This spirit was in-stilled by Abraham-Louis Breguet himself, who was responsible from 1775 onwards for most of the watchmaking innovations of that era: the tourbillon, the perpé tuelle watch, the natural escapement, the constant-force escapement, the “obser-vation” seconds counter (which gave rise to the chronograph), the shock absorber, the Breguet balance-spring with its ter-minal curve, the gong-spring (for chiming watches), the first wristwatch, etc.
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To give shape to this approach based on continuous progress, the Manufacture deci ded to develop a collection in parallel with its existing ones and named Expérimentale. This series of special timepieces pays trib-ute to A.-L. Breguet’s creations that all underwent an experimental phase.
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This experimental collection is designed to showcase the brand’s latest technical and aesthetic developments. It offers a glimpse of what Breguet watchmaking will look like in the future. For collectors, it is also an opportunity to be among the first to ac-quire high-end timepieces in strictly limited series, of which the scientific content will be developed in subsequent collections.
Expérimentale 1, pioneering by nature
While the first timepiece in this new collec-tion marks the final chapter in Manufacture Breguet’s 250th anniversary celebrations, it also represents the first chapter of its future. An inaugural creation whose purpose is to pave the way for the House going forward.
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The Expérimentale 1 is not a spontaneous creation, stemming instead from many years of R&D work carried out behind the scenes and that has given rise to the current watches, notably the Classique, Tradition, Marine and Type XX collections. The Expérimentale programme aims to highlight this R&D shedding light on the entire field of horology through its work on materials, electromagnetism, vibratory mechanics and acoustics. Science in the broadest sense of the term, connecting with design.
Highlighting remembrance
For this first instalment, Breguet has fulfilled two objectives. The first, fundamental goal underpinning all technical end eavours is the quest for precision. The second is to build a bridge between legacy and the future. This approach is being rolled out as part of the House’s 250th anniversary celebrations. Highlighting the historical significance of the Expérimentale 1 seemed an obvious choice.
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These ties with the past are expressed by making this timepiece part of the Marine collection. The aim is to recall that, after his appointment to the Paris Bureau des Longitudes in 1814, A.-L. Breguet was awarded the title of Horloger de la Marine Royale (Watchmaker by appointment to the Royal Navy) by Louis XVIII.
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This distinction was the most prestigious a watchmaker could possibly receive, as the very notion of maritime horology required scientific expertise. The Expérimentale 1 represents a continuation of this tradition, showcasing technical breakthroughs that are already shaping the future of Haute Horlogerie.
Inspired design
The Expérimentale 1 is based on several complementary aesthetic foundations in-teracting to form a unique and harmonious whole. For this first opus, the designers drew inspi-ration from the history of the Marine collection, with L’Expérimentale featuring some of its codes: a sporty case, close-set central lugs, a rubber strap (interchangeable for the first time), as well as utmost attention devoted to readability – notably enhanced by all-luminescent indications.
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From a historical perspective, it echoes the aesthetic codes of Reference 3448, partic-ularly in terms of its dial display and move-ment architecture. Furthermore, the Expérimentale 1 echoes the Reference 1747 model created in 1997 to mark the 250th anniversary of A.-L. Breguet’s birth.
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Pocket marine chronometer Breguet No. 3448,
sold in 1820 to the astronomer Alexis Bouvard
This establishes a natural connection with the Expérimentale 1, unveiled in 2025 to celebrate the 250th anniversary of the birth of the Manufacture that has borne his name since 1775. Another obvious link is that the 1747 was the first wristwatch to feature a regulator display in Breguet’s recent history – and the likewise regulator-type Expérimentale 1 is its legitimate successor.
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The lineage dates all the way back to the authentic Marine Chronometer No. 104 by A.-L. Breguet. At the time, the great watch-maker was exiled from France, where the Revolution was raging. The piece was start-ed in the temporary workshop he had set up in Le Locle. No. 104 was Breguet’s first known marine chronometer, just as the Expérimentale 1 is Breguet’s first pure R&D model; finally, No. 104 was the first to use Arabic numerals (extremely rare at the time), which are also picked up on the Expérimentale 1.
The quest for precision
On a technical level, the choice of distinctive characteristics contributing to enhanced accuracy was just as obvious. Precision was and remains the driving force behind Breguet’s innovation. It was the reason for almost all the innovations introduced by A.-L. Breguet, a watchmaker who spent his entire life perfecting the art of horology.
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It should be noted that Breguet filed very few patents during his lifetime, as they were rarely needed at the time. Two of them did however leave an indelible imprint on their era. The first was filed on 9 March 1798 and related to constant force, while the second registered on 26 June 1801 was intended to protect the tourbillon. Two centuries later, Manufacture Breguet is following in the great watchmaker’sfootsteps by pushing these two fundamental areas of endeavour up a further notch on the tourbillon and the constant-force escapement.
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Together with the magnetic escapement, they form the heart of the Expérimentale 1. Like A.-L. Breguet’s original creations, its components, have been designed to bring real added value to the product. The Expérimentale 1 heralds a new era for watchmaking, in which the Manufacture will showcase the fruits of its watchmaking and scientific research.
Setting the terms of the horological equation
The quest for accuracy cannot be reduced to one sole problem with a single solution, instead combining at least three variables. The first is the consistent amplitude of the balance. The latter is located downstream from the barrel, whose torque decreases as the power reserve is depleted.
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It is therefore inherently very difficult for the balance to maintain a constant amplitude if the energy it receives is not consistent. The second is the influence of Earth’s gravity, which particularly affects the entire regulating organ (balance and hairspring), thereby impacting its performance.
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The third factor is shock resistance. All con-temporary watches are subjected to accel-erations that are multiples of the Earth’s gravitational acceleration expressed in “gs”. More dramatically, they can be subjected to impacts – including those involved in sim-ply placing a watch on a hard surface. Every impact and every movement affects the regular running of the watch – and hence impairs its precision.
Forward-looking solutions
The quest for accuracy cannot be reduced to one sole problem with a single solution, instead combining at least three variables. The first is the consistent amplitude of the balance. The latter is located downstream from the barrel, whose torque decreases as the power reserve is depleted.
Click, to see the large size. ▶ BIG FOTO 
It is therefore inherently very difficult for the balance to maintain a constant amplitude if the energy it receives is not consistent. The second is the influence of Earth’s grav-ity, which particularly affects the entire regulating organ (balance and hairspring), thereby impacting its performance.
Click, to see the large size. ▶ BIG FOTO 
The third factor is shock resistance. All con-temporary watches are subjected to accel-erations that are multiples of the Earth’s gravitational acceleration expressed in “gs”. More dramatically, they can be subjected to impacts – including those involved in sim-ply placing a watch on a hard surface. Every impact and every movement affects the regular running of the watch – and hence impairs its precision.
Breguet’s first-ever 10 Hz tourbillon
with constant-force magnetic escapement
Since the early 2010s, the Manufacture has continued to perfect its mastery of the magnetic field. While this has now been extended to the escapement, its founding principle remains the same: to create a carefully controlled magnetic field and interactions.
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This involves two escape-wheels each equipped with a magnetic track, at the centre of which beats a pallet-lever with likewise magnetic pallets. The idea is to take cues from constant-force escapements. Below a certain operating torque, the tourbillon stops very quickly, while above this threshold, the balance oscillates at its maximum amplitude.
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This new escapement also makes it possible to decouple the impulses transmitted to the balance from the rotation of the escape-wheel and hence from the rest of the gear train. Unlike in a Swiss lever movement, the inertia of the tourbillon cage has almost no influence. By decoupling these two functions, Breguet has been able to create a tourbillon with a 10 Hz oscillator in such dimensions, also giving free rein to design choices, for example by offsetting its balance from the cage’s centre of rotation.
Technical description of the tourbillon
Compared to most traditional tourbillons operating at 2.5 Hz, this represents a fourfold increase. This 10 Hz frequency is even significantly higher than most classic Swiss lever escapement watches without tourbillons, almost all of which run at 3 or 4 Hz. The 10 Hz tourbillon with magnetic escapement is therefore more stable and more accurate than most contemporary wristwatches. The Expérimentale 1 wristwatch is certified by the Breguet hallmark in the “Scientific” category, meaning it has a guaranteed accuracy of +/- 1 second over a 24-hour period.
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The construction of the escapement mechanism is also unusual. Between its two escape-wheels equipped with a magnetic track, an intermediate stop wheel ensures that the device does not suffer any unwanted jumps. Most of the other tourbillon components are non-magnetic, in order to avoid any interaction that could interfere with its smooth running. The balance-spring is made of silicon, the fixed fourth wheel of LIGA (NiP12) and the other components of titanium or nivagauss.
Avant-garde aesthetics
The Expérimentale 1 is housed in a 43.5 mm-diameter Breguet gold case, a size inspired by the standards of the Marine collection. In terms of design, the timepiece is inspired by the pocket watch No. 3448, picking up the latter’s key characteristics with a regulator-style display and symmetrical movement while taking them to a new level by merging front and back. The Expérimentale provides full visibility, thanks to a sapphire dial providing a view of the entire movement.
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The regulator-type display features hours at 6 o’clock, offset minutes and seconds on the tourbillon at 12 o’clock. Already tried and tested by A.-L. Breguet back in his day, this layout ensures greater legibility and also contributes to accurate timekeeping.
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The Expérimentale 1 also features a patented twin barrel, like the Breguet no. 3448, but this time on two series-coupled levels, each consisting of a double spring separated by a sapphire spacer, arranged on either side of the minutes axis at 3 and 9 o’clock respectively. This double-sprung mechanism serves to optimise energy management in relation to the space available.
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Finally, most of the traditional characteristics of a Breguet watch are present: a double-stepped fluted caseband, six close-set lugs – of which two are dedicated to the interchangeability mechanism and the four others are facetted, alternating between sandblasted blued and satin-brushed finishes as well as a blue ALD-treated Breguet gold inlay – blue open-tipped hands enhanced with Super-LumiNova®, a secret signature on the sapphire dial and Breguet numerals. Above and beyond these features, the aesthetic vocabulary of the Expérimentale 1 has been completely reinvented.
A 21st century creation
The first thing to note is the construction of the solid gold bridges, whose soft curves have given way to sharp angles. Their surface is satin-brushed, while the angles are hand-finished and mirror-pol-ished to accentuate the rigorous geome-try of their design. Breguet gold, combined with the navy blue coating, reveals itself in all its complexity with a blend of warmth, brilliance and intensity. The blue hue of the barrel springs is also a first for Breguet.
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The sapphire dial rests on four gold pillars. It displays the hours, formed by three linked luminescent circles. The large peripheral minutes track sur-rounds the chapter ring at 6 o’clock, while the tourbillon appears to escape from its confines, sitting freely at 12 o’clock – two-thirds inside the minutes track and one-third above it.
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It is here, directly above the Breguet gold mainplate, that the Manufacture has chosen to place the Expérimentale 1 cartouche, symbolically crowning the entire composition – and more particularly its 10 Hz tourbillon with a constant-force magnetic escapement. The latter consists of a large rounded-off polished bridge, with the small seconds dial resting at its centre.
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TECHNICAL SPECIFICATIONS
Model: Expérimentale 1 Constant-Force Magnetic 10 Hz Tourbillon Edition
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Ref. E001BH/S9/5ZV
Key features
First piece in a new line dedicated to forward-looking Haute Horlogerie
First constant-force magnetic escapement
10 Hz tourbillon used as the main timekeeping basis
Regulator-type display inspired by the Breguet No. 3448
Breguet hallmark-certified in the scientific class (+/- 1s/day)
18K gold movement
Material 18K Breguet gold
Diameter 43.5 mm
Thickness 13.30 mm
Double-stepped fluted caseband
Hollowed-out close-set lugs with blue ALD-treated gold inlays
Crown with blue ALD-treated sandblasted gold inlay
Upper glass: box-type sapphire crystal, glare-proofed on both sides, hydrophobic
Lower glass: flat sapphire crystal, engraved with the 250th anniversary inscription, glare-proofed on both sides, hydrophobic
Water resistance: 10 bar (100 metres)
54 components
Dial
Sapphire dial glare-proofed on both sides
Regulator-type display: hours at 6 o’clock, offset minutes, seconds on the tourbillon
Gold applied chapter ring and seconds ring enhanced with Super-LumiNova®
Minutes track enhanced with Super-LumiNova®
Expérimentale 1 blue ALD-treated applique enhanced with Super-LumiNova®
- Breguet signature at 9 o’clock
- Individual number at 3 o’clock
- Secret signature at 11 o’clock and 1 o’clock on the minutes track
Blue ALD-treated titanium seconds hand with Marine-anchor counterweight
Indications
Hours, minutes, seconds on the tourbillon cage
Movement
Caliber 7250, numbered and signed Breguet
Thickness 6.3 mm
33.8 mm wide, 15 lignes
6.3 mm thick
Movement certified with the Breguet hallmark in the Scientific category
18K gold Breguet movement blanks
Manual winding
Two series-coupled barrels with four blue springs
266 components
37 jewels
72-hour power reserve
Resistance to magnetic fields up to 600 gauss
Tourbillon
Constant-force magnetic escapement
Grade 2 titanium escape-wheel
NiP12 pallet-wheel
10 Hz frequency, 72,000 vibrations/hour
Breguet balance with flat silicon hairspring, non-magnetic balance-staff
Grade 5 titanium tourbillon blanks
Weight: 0.60 g
74 components (cage)
13.7 mm in diameter (cage)
5.45 mm thick (cage)
Strap
Blue rubber with tool-free interchangeability
Interchangeable 18K Breguet gold pin buckle
Breguet gold weight: 104 g
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BOX
Individually numbered red leather 250th anniversary special edition
inspired by the historical red Moroccan leather Breguet presentation
boxes
Warranty 5-Year International Sales Warranty
Available in Breguet Boutique around the world
🔰Edition ✅Only ❱❱❱ 75 Pieces
🔴 Price: CHF 320,000 💰
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Press release - 2025
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