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Jaeger-LeCoultre’s Duometre returns in a specific, highly complicated form: the Duometre Grande Complication A Grande Sonnerie, announced on 9 September 2026 as reference Q603H480. The company describes it as a single-piece edition and a new interpretation of Calibre 182, combining automatic chimes, a minute repeater, a flying tourbillon and a perpetual calendar. Its Duometre architecture separates the energy paths for timekeeping and chiming while linking them to one regulating organ.
What is the new Jaeger-LeCoultre Duometre?
It is not a return of the entire Duometre line to one common design. The announcement is for one exceptional chiming wristwatch: the Duometre Grande Complication A Grande Sonnerie. Jaeger-LeCoultre says the original Calibre 182 debuted in the Hybris Mechanica A Grande Sonnerie in 2009; the 2026 watch reinterprets that calibre and is the Maison’s first chiming Grande Complication for the wrist, according to its 9 September 2026 announcement.
Calibre 182’s complications
The manually wound Calibre 182 combines Grande Sonnerie, Petite Sonnerie, minute repeater and perpetual calendar functions with a flying tourbillon. Jaeger-LeCoultre counts 15 complications and reports approximately 1,300 movement parts. The calendar accounts for varying month lengths and leap years; if the watch remains wound, the company says it needs no manual adjustment before 2100. That is the next century-year exception in the Gregorian calendar: 2100 is not a leap year.
Case, dial and strap
The official specification gives a case measuring 45 mm across and 16.16 mm thick, with an 18K 5N pink-gold exterior and a titanium inner body. It has a sapphire caseback, an openworked sunray-guilloché dial beneath blue-grey lacquer, and a black alligator strap. The reference is Q603H480.
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What does the Duometre mechanism do?
The Duometre principle is an energy-management design. Jaeger-LeCoultre says it introduced the mechanism in 2007: two barrels drive separate gear trains, which are linked to one regulating organ. The aim is to keep energy-intensive additional functions from drawing power through the same train that drives timekeeping. This describes the design rationale; it does not by itself establish that a particular watch is more accurate.
In Calibre 182, Jaeger-LeCoultre assigns one train to time and calendar indications and another to the chimes, and reports a third barrel in addition to the usual two-barrel Duometre arrangement. The company’s technical explanation of the mechanism describes the general two-train architecture; the 2026 release supplies the Calibre 182-specific arrangement.
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What does the Grande Sonnerie do?
A Grande Sonnerie chimes the hours and quarter hours automatically as time passes. Petite Sonnerie is a different automatic striking mode, while a minute repeater is activated on demand. In this watch, four gongs and four hammers sound four notes—E, C, D and G—in combinations Jaeger-LeCoultre describes as Westminster-style. The company says the Sonnerie plays the quarter melody before the corresponding hour; the minute repeater sounds the hours, quarters and then minutes.
Modes and reserves
A selector provides Grande Sonnerie, Petite Sonnerie, silence and time-setting modes. Jaeger-LeCoultre also reports a safeguard that prevents a second minute-repeater trigger before the previous sequence has reset. The manufacturer publishes these reserve and chiming-duration figures:
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| Function or mode | Published duration |
|---|---|
| Time and calendar | 48-hour power reserve |
| Grande Sonnerie | 7.5 hours of continuous chiming |
| Petite Sonnerie | Up to 32 hours of continuous chiming |
All three figures are Jaeger-LeCoultre’s published specifications for this 2026 model, not independent measurements.
What is new about the Duometre Grande Sonnerie?
Jaeger-LeCoultre describes revisions to the acoustic system: the gongs are longer and reshaped, and their fixing and tuning have been refined. It also says the titanium inner case body and caseback bezel contribute to sound quality. These are manufacturer-reported engineering changes and intended benefits; the announcement does not provide independent acoustic measurements or listening-test results.
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The company reports eight patents for movement developments and a ninth for the strap-buckle micro-adjustment. It says assembly and regulation take one year and involve 16,000 operations across assembly, disassembly, correction and cleaning, and final assembly. These figures illustrate the maker’s account of the production process rather than an outside assessment of the movement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How does it compare with the Duometre Chronograph Moon?
The Chronograph Moon is a useful point of comparison, but it is not a like-for-like alternative. The official Duometre Chronograph Moon Q622252J product page describes a manually wound Calibre 391 with a monopusher chronograph, moon phase, day/night display, twin power reserves and foudroyante seconds.
| Comparison | Duometre Grande Complication A Grande Sonnerie | Duometre Chronograph Moon Q622252J |
|---|---|---|
| Core complication proposition | Grande Sonnerie, Petite Sonnerie, minute repeater, perpetual calendar and flying tourbillon (Jaeger-LeCoultre, 2026 announcement) | Monopusher chronograph, moon phase, day/night display and foudroyante seconds (Jaeger-LeCoultre product page) |
| Calibre and winding | Calibre 182; manually wound (Jaeger-LeCoultre, 2026 announcement) | Calibre 391; manually wound (Jaeger-LeCoultre product page) |
| Energy or reserve information | 48-hour time/calendar reserve; separate published continuous-chiming durations by Sonnerie mode (Jaeger-LeCoultre, 2026 announcement) | Twin power reserves are listed; durations are not stated on the cited product page |
| Case size and materials | 45 mm × 16.16 mm; 18K 5N pink gold and titanium inner body (Jaeger-LeCoultre, 2026 announcement) | Not stated here; consult the cited product page for its current specification |
| Edition and availability | Described as a single-piece edition; price and broader retail availability are not stated in the announcement | Availability for comparison is not stated here; consult the cited product page |
The Duometre collection’s official release archive also records the 2026 Grande Sonnerie and Heliotourbillon Perpetual announcements alongside the 2024 Chronograph Moon and Heliotourbillon Perpetual releases. For Q603H480, the 2026 announcement does not state a retail price or broader availability, so a price comparison cannot be made from that source.
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