Why Does the Breguet Tradition 7047 Use a Fusée and Chain?

Most watch movements hide their cleverest parts. The Breguet Tradition 7047 does the opposite. Turn it towards the light and you can watch a tiny chain wind itself around a cone, while a tourbillon cage turns beside it once a minute. It looks like a museum piece because, in a sense, it is one. Both mechanisms were solving problems long before the wristwatch became common.

So why would a modern watch use them? The short answer is that the fusée and chain fixes a problem every mechanical watch still has. The longer answer takes in six centuries of horology.

What problem does a fusée and chain solve?

A fusée and chain delivers more even power from the mainspring to the rest of the movement.

Every mechanical watch is driven by a coiled mainspring. When it is fully wound, it pushes hard. As it unwinds, its force drops. That changing force reaches the balance wheel, and a balance that receives uneven energy tends to keep uneven time.

A fusée is a cone-shaped pulley with a spiral groove cut into it, connected to the mainspring barrel by a chain. When the spring is fully wound and strongest, the chain pulls on the narrow end of the cone, where it has the least leverage. As the spring weakens, the chain works its way down to the wider end, where it has more leverage. The two effects offset each other, so the force reaching the gear train stays close to constant.

Think of it as a bicycle that changes gear automatically as your legs get tired.

Where did the fusée come from?

The fusée is one of the oldest ideas in mechanical timekeeping. A fusée appears in a crossbow mechanism in a manuscript from 1405, and the Burgundy Clock of around 1430 is generally cited as the earliest surviving clock to use one. By the 17th century it was standard in watches.

It stayed in use for a long time where accuracy mattered most. Marine chronometers, the instruments ships relied on to calculate longitude, kept the fusée until they were made obsolete in the 1970s.

Why did most watchmakers stop using it?

Mainstream watchmaking abandoned the fusée because it became possible to get good results without it. Better escapements, such as the lever, were less sensitive to changes in spring force, and the going barrel offered a simpler, slimmer way to deliver power. Improvements in balance springs helped too.

Just as important, the fusée is bulky and very difficult to make. A fusée chain is assembled from a great many tiny links and pins, each of which has to be cut, finished and riveted by hand. Swiss and American makers had largely moved on by the middle of the 19th century.

That is exactly why its reappearance in a modern watch is notable. It is not there because it is the only way to keep good time. It is there because it is one of the most demanding ways to do it.

What is a tourbillon, and did Breguet invent it?

Yes. Abraham-Louis Breguet patented the tourbillon on 26 June 1801, a date recorded in the French Republican calendar as 7 Messidor, Year IX. In 2026 the invention marks its 225th anniversary.

A tourbillon places the balance wheel and escapement inside a rotating cage. Breguet designed it for pocket watches, which spent most of the day upright in a waistcoat pocket. In that position, gravity pulls on the balance in the same direction for hours, which can cause consistent timing errors. By rotating the whole assembly, typically once a minute, the tourbillon averages those errors out.

Whether a tourbillon improves accuracy in a wristwatch, which moves through many positions during the day, is a long-running debate among watchmakers. What is not in debate is how difficult it is to build well.

What movement is inside the Breguet Tradition 7047?

The 7047 uses Breguet calibre 569, a hand-wound tourbillon movement with a fusée-and-chain transmission. Key details:

Frequency: 2.5 Hz (18,000 vibrations per hour), a relatively slow and traditional rate.
Tourbillon: a titanium carriage that turns once per minute, carrying a titanium balance wheel.
Balance spring: silicon, shaped with a Breguet overcoil. Abraham-Louis Breguet developed the overcoil in 1795 to help the spring expand and contract more evenly.
Escapement: uses silicon components, which are light, anti-magnetic and need little or no lubrication.
Power reserve: Breguet currently quotes 55 hours. Earlier published specifications give 50 hours.
Power reserve indicator: driven from the barrel through a differential, a design for which Breguet filed a patent application.

There is a nice symmetry here. The movement combines two of the oldest ideas in precision timekeeping, the fusée and the tourbillon, with one of the newest materials, silicon.

What is the Breguet Tradition collection based on?

The Tradition collection launched in 2005 and takes its design from Breguet's "souscription" watches, which first appeared in the company's records around 1796.

The souscription was an early example of smart manufacturing. Buyers paid a quarter of the price up front, which let Breguet plan production and pay his craftsmen in advance. The watches themselves were deliberately simple: a single hand, a white enamel dial and a large central barrel, built for reliability rather than ornament.

The Tradition line borrows the architecture of those movements, especially the symmetrical layout and the stepped bridges, and moves it to the dial side where it can be seen. The 7047, unveiled in 2010, applied that idea to a tourbillon with fusée and chain. In 2026, for the tourbillon's 225th anniversary, Breguet added a limited blue-enamel version, a sign the model remains central to the collection. Other members of the family include the 7027, the original 2005 model, and the 7077 Chronographe Indépendant.

What does the 7047PT look like in the metal?

The 7047PT/11/9ZU is the platinum version with a silvered dial. Its main details:

Case: 41mm in 950 platinum, about 16mm thick, with Breguet's fluted caseband and a sapphire caseback.
Dial: off-centre and silvered gold, with hand-engraved guilloché made on a rose engine, Roman numerals and blued steel Breguet "pomme" hands.
Crystal: a domed sapphire that gives room for the raised tourbillon and fusée.
Water resistance: 30 metres.

On the wrist, the watch reads as a working movement more than a dial. Most of what you see is plate, bridge, chain and cage.

Which other modern watches use a fusée and chain?

The fusée remains rare in modern wristwatches. Outside Breguet, the most often cited examples come from A. Lange & Söhne, whose Tourbillon Pour le Mérite was one of four models in the brand's 1994 relaunch. Lange still uses the system in watches such as the Richard Lange Tourbillon Pour le Mérite, and a small number of independent makers have built movements around it as well.

Few manufacturers take on a mechanism this demanding. In Breguet's case, it sits alongside the complication the house actually invented, which is part of what makes the 7047 such a coherent piece of watchmaking.

Is the Breguet 7047 collectible?

The 7047 is not a watch people buy casually. From our perspective as dealers, its appeal is in what it represents: two historically significant complications, made by the house most closely connected to one of them, in a design that shows both openly.

For a secondary-market buyer, original box and papers and a documented service history matter a great deal on a watch like this. A fusée-and-chain tourbillon should be serviced by a watchmaker with the experience and parts to do it properly, which in practice usually means Breguet.

The Breguet Tradition 7047PT at Investment Watches

We currently have a 2014 Breguet Tradition Tourbillon Fusée ref. 7047PT/11/9ZU in platinum with a silvered, hand-guilloché dial. It is in excellent condition and comes with its original box and papers.

It is best appreciated under a loupe, where you can follow the chain from barrel to fusée. If you would like to see it at our Austin showroom or talk it through with our team, we would be glad to arrange it.

Quick facts: Breguet Tradition Tourbillon Fusée 7047PT

Collection: Tradition (launched 2005)
Model introduced: 2010
Case: 41mm 950 platinum, approx. 16mm thick, 30m water resistance
Movement: Breguet calibre 569, hand-wound tourbillon with fusée and chain
Frequency: 2.5 Hz (18,000 vph)
Balance spring: silicon with Breguet overcoil
Power reserve: 55 hours per Breguet's current specification (50 hours in earlier published specs)
Dial: silvered gold, hand-engraved guilloché, Breguet hands