"Sorry, Isaac!"

“1801”, a special number in the world of time: the beginning of a history, an evolution, and a tribute to defying Isaac Newton's law of nature, the Breguet way

When a short phrase like "Sorry, Isaac!" is not just a playful greeting to the scientist who discovered the law of gravity, but a declaration of a great mechanical victory in fine watchmaking (Haute Horlogerie)

The beginning of history

In the era when pocket watches sat vertically in a waistcoat pocket and were affected by the Earth's gravity, their accuracy drifted.

Abraham-Louis Breguet therefore invented a way to cancel out the effects of gravity, the "Tourbillon", which was officially patented on 7 Messidor an 9, corresponding to 26 June 1801 in the French Revolutionary calendar

breguet-sorry-isaac-brevet-breguet-tourbillon

Understanding the 1801 tourbillon patent: When a watch is upright, gravity affects its most vital parts, the balance wheel and hairspring, shifting the hairspring's center of gravity, making friction on the pivots uneven and causing lubricant to pool to one side. The result is that the watch runs "fast" or "slow".

So how did Breguet solve this problem?

Instead of trying to stop gravity, Breguet chose to "balance it through rotation", as follows:

Place the entire regulating organ (balance wheel, hairspring and escapement) inside a rotating cage.
Design the cage to make a full 360-degree turn every minute.
As the cage keeps turning, the rate error that runs "fast" in one position is automatically offset by the error that runs "slow" in another.

To make it easier to understand, imagine: an acrobat constantly spinning on a rope or a ball, who may tilt left or right yet keeps a steady, continuous rotation. Or think of a simple average: if you lean left for half a minute, then lean right for half a minute, your average position over that minute returns to the center. That is the heart of the tourbillon, which gives a watch its highest precision.

In addition, he invented the Breguet overcoil, bending the outer end of the hairspring up and toward the center to reduce the shift of its center of gravity, so the hairspring expands and contracts concentrically. This makes the balance wheel and the movement's frequency even more stable.

A commemorative timepiece: Breguet Classique Grande Complication REF. 1801

For the 200th anniversary of the patent in 2001, under the leadership of Nicolas G. Hayek, Breguet held a grand celebration at the Palace of Versailles with the historic Breguet Classique Grande Complication REF. 1801, available in both limited and regular editions.

breguet-sorry-isaac-breguet-1801br-limited

Limited editions (2001/2002)

Feature (Specifications)	Details
Case	Approx. 40.5–42 mm, 10.3–11.3 mm thick
Case material	18K rose gold, 18K white gold and platinum
Front/back design	Demi-savonnette (half-hunter) front cover opened by a pusher; exhibition caseback showing the movement
Movement	Manual Winding - Calibre 557T / 558T
Rose Gold	REF. 1801BR/29/2W6 – limited to 28 pieces, white Grand Feu enamel dial with Breguet numerals
White Gold	REF. 1801BB/29/2W6 – limited to 28 pieces, Grand Feu enamel dial
Platinum	REF. 1801 – believed to be limited to just 10 pieces guilloché dial

Regular editions

Specifications	Details
Case	Approx. 40.5–42 mm, 10.3–11.3 mm thick
Case material	18K rose gold and 18K white gold
Front/back design	Demi-savonnette (half-hunter) front cover opened by a pusher; exhibition caseback showing the movement
Movement	Manual Winding - Calibre 557T / 558T
Dial	Rhodium-plated metal with vertical Côtes de Genève decoration and Roman numerals
Rose Gold	REF. 1801BR/12/2W6
White Gold	REF. 1801BB/12/2W6

Why collectors and mechanism lovers care

REF. 1801 uses a classic pocket-watch design with a hand-guilloché demi-savonnette cover. Closed, only a small aperture shows the time; when the wearer presses the pusher on the crown, the cover springs open to reveal the splendor of the tourbillon cage, a truly personal pleasure for the owner.
Masterpiece engraving: The back of the Calibre 557T/558T is beautifully hand-engraved with Rococo floral motifs and the historic inscription "Brevet du 7 Messidor an 9" (the patent date in the French Revolutionary calendar, corresponding to 26 June 1801)

Why do today's collectors still love REF. 1801 more than 25 years later?

Because the demi-savonnette creates an "open the cover and wow" experience, like opening your own treasure box that does more than tell time.

It tells a story: every time you press the pusher, you connect yourself to 225 years of Haute Horlogerie history.

In an era when people value storytelling and craftsmanship more than complications alone, REF. 1801 is one of Breguet's most "precious" timepieces.

The evolution of Breguet's tourbillon after the patent

After receiving the patent, Breguet made only 35–40 tourbillon watches before this legendary mechanism lay dormant for decades. It returned gracefully on the wrist during the brand's revival in the late 1980s, under Daniel Roth and developed from the Nouvelle Lemania base, which was later fully integrated into Manufacture Breguet.

Here is the notable tourbillon lineage, based on reliable official information, in order of development:

1) Calibre 558 / 557T, carrying the direct DNA after the patent, and its successor, the Calibre 187 series

The REF. 3350 of 1989 was Breguet's first tourbillon wristwatch, powered by the manual-winding Calibre 558, with a one-minute tourbillon cage, 2.5 Hz (18,000 vph), about 50 hours of power reserve, and usually a seconds hand on the tourbillon cage.

Meanwhile, Calibre 557 / 557T

was used for the patent's 200th anniversary in the special Breguet Classique Grande Complication 1801 (Tourbillon à Versailles) of 2001/2002, keeping the spirit and core structure of the same lineage.

Today it has moved on to a new heir, Calibre 187B, an upgraded Cal. 558 with about 41% of parts changed, improved magnetic resistance from a silicon escapement and Nivachron balance spring, and power reserve increased to about 60 hours, still at 2.5 Hz. A notable model is the Classique Tourbillon 7357 (in platinum and Breguet Gold), the direct heir to REF. 3350.

And Calibre 187M1, developed for a flying tourbillon with a Mysterious Display that makes the cage appear to float mysteriously in mid-air. A notable model is the Classique Tourbillon Sideral 7255 (limited edition), a tourbillon watch that is “Breguet's first flying tourbillon”

2) Calibre 581 series

2014 marked a major leap to the extra-thin automatic tourbillon, about 3 mm thick, with a titanium cage, silicon balance spring and silicon escapement, 4 Hz (28,800 vph), and up to about 80 hours of power reserve.

A standout is Cal. 581DPE, with a perpetual calendar module and running equation of time.

Notable models with this movement series are

Classique Tourbillon Extra-Plat 5377 and 5367
Marine Tourbillon Équation Marchante 5887 (limited to 25 pieces in the 225th-anniversary version, with a sky dial matching 26 June 1801)

3) Calibre 569 / 569T

A manual-winding movement combining a tourbillon with a Fusee-and-Chain system, which delivers consistent torque to the gear train and tourbillon cage even as the mainspring runs down, using a titanium tourbillon cage with a silicon Breguet-overcoil balance spring, 2.5 Hz and about 50–55 hours of power reserve. A notable model is the “Tradition Tourbillon 7047”.

Into the present and future with the Tourbillon 225th Anniversary collection

To celebrate the 225th anniversary of the tourbillon patent, Breguet unveiled these masterpieces:

THE LATEST TOURBILLON NOVELTIES

1. Classique Tourbillon 7357 (REF. 7357PT/1A/386 & 7357BH/1H/386)

- Direct heir to REF. 3350, powered by Cal. 187B

- Available in platinum and 18K Breguet Gold

- Gold dial with guilloché (Clous de Paris & Barleycorn)

- Caseback engraved with the Dent de Vaulion, inspired by the famous peak of the Vallée de Joux

2. Classique Tourbillon Sideral 7255 (REF. 7255PT/2N/9VU)

- Breguet's first watch to combine a flying tourbillon with the Mysterious Display

- Platinum case

3. Tradition Tourbillon 7047 (REF. 7047PT/YY/5ZU SL)

- Striking Bleu de France tones on the dial, bridges and fusée-and-chain

- Platinum case

4. Marine Tourbillon Equation Marchante 5887 (REF. 5887PT/YS/5WVSL)

- Limited to just 25 pieces worldwide

- Platinum case, 43.9 mm

- Two-level dial with blue Grand Feu enamel and a hand-painted depiction of the sky over Paris at midnight on 26 June 1801 (the patent date)

Timeline of Breguet tourbillon history

Year	Details
1795	Abraham-Louis Breguet conceives the tourbillon
1801	Official 10-year patent granted by the French Ministry of the Interior
1801 – 1823	In his lifetime, Breguet sold only 35–40 tourbillon watches
1989	Breguet unveils its first modern-era tourbillon wristwatch (REF. 3350), powered by Cal. 558
2001/2002	Launch of the Breguet Classique Grande Complication 1801 (Tourbillon à Versailles) for the patent's 200th anniversary
2010-2020	Development of the extra-thin Cal. 581 (peripheral rotor) using modern silicon and titanium
2026	Celebrating 225 years of the tourbillon patent with the "Sorry, Isaac" campaign and the launch of REF. 7357, 7255, 7047 and 5887

That is the brief history that began with “the patent Tourbillon 1801”

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Image and reference credits (Part 1)

https://www.watchprosite.com

https://www.breguet.com

https://ineichen.com

https://everywatch.com

https://swisshours.com

https://www.hodinkee.com

Image and reference credits (Part 2)