Franck Muller Aeternitas Mega 4

Swiss luxury watch brand Frank Muller unveils Aeternitas Mega 4: the world’s most complicated wristwatch which incorporates 36 complications and 25 of them are visible. It took 5 years to make this grand complication watch, which consists 1,483 components, a 999-year calendar and comes in a price tag of 2.7 million dollars.

The Aeternitas movement served as a base, while the Mega 4 represents the apotheosis of the art of watchmaking with its grand and small Westminster chime striking-work, the only one available on the market with a tourbillon visible on the dial. Added to this are a minute repeater, a mono-pushpiece split-seconds chronograph, a perpetual calendar secular, and an equation of time which only varies by 6.8 seconds per lunar month, the equivalent of one day every thousand years.

Although the first piece of this exceptional, limited series was presented to an American collector at a ceremony in Monaco last November, the Master Watchmakers of Genthod are already putting the finishing touches to a second Aeternitas Mega 4, which will be available in the very near future.

The Aeternitas Mega is the pinnacle of success in the art of watch-making in terms of complexity and complications. A grandiose work of art culminating in the design of the most complex wrist watch ever made in the world thanks to the multifaceted skills of our watch-makers and constructors.

Each of the 1,483 components was designed to give the watch an elegant design in the pure traditions of the old “cadraturiers” (the mechanisms located under the dial) of the Vallée de Joux, Switzerland. This watch inspires countless emotions as an exceptional time piece and simply unique in the eyes of lovers in the art of fine mechanics and luxury watch making.

From the very beginning, the Mega was incorporated in to the Aeternitas project and is, indeed, the culmination of this project. The basis was always the same, an automatic Tourbillon, but, with two motors. The plate has been hollowed out on the dial side to hold the striking mechanism.

In comparison to the Aeternitas versions, the four Aeternitas Mega versions only have a thickness of 0.2mm as it had to accommodate the striking mechanism of the “Chime of Westminster”. The Mega sets itself apart thanks to its “Grande Sonnerie” Chime of Westminster striking mechanism sounding on the hours and quarter hours. In the “Petite Sonnerie” version, the strike on the hour is removed, and it only sounds on the quarter hours.

The programming of the large and small striking mechanisms is done through simple pressure on a waterproof push-button placed at the 10.30 mark on the watchcase. This push-button programmable function enables the movement of the striking mechanism to be stopped.

The minute repeater enables the “Chime of Westminster” to be activated at any time, and so giving the complete strike of the hours, the Westminster quarters and the minutes. The “Grand Sonnerie” is the only watch in which the Tourbillon is visible on the dial side, which limits the space available for the “Grand Sonnerie” mechanism and thus makes the design even more complicated.


Hour, minute & second display
1. Day-Night display
2. Grand strike
3. Small strike
4. Silence
5. Minute Repeater
6. Westminster Carillon on 4 gong
7. Programming of the Grand strike-Small strike function with a waterproof push-piece and display on the dial
8. Programming of the Strike-Silence function with a waterproof push-piece and display on the dial
9. Lifting-lever mechanism of the strike when in hand-setting position
10. Mechanism which not allow the start of a new strike if the precedent is not to the end
11. Bolting mechanism of the hand-setting during the strike
12. Transmission mechanism to the hammer which permit the adaptation to different shape of the gong
13. Movement power reserve indicator
14. Strike power reserve indicator
15. Silent Centrifugal governor of the rate of the strike
16. Flying Tourbillon on a ball bearing with ceramic balls
17. Balance wheel with adjustment screws in gold, without index
18. Breguet overcoil with Phillips curve
19. Tourbillon carriage, without any bridge, visible in the dial
20. Automatic self-winding-mechanism of the movement with platinum micro rotor
21. Automatic self-winding-mechanism of the Westminster carillon with a platinum micro rotor
22. Perpetual Calendar
23. Display of the days
24. Display of the months
25. Retrograde Date
26. Secular Calendar
27. Display of the year up to 999 years
28. Bissextile year display
29. Indication of the secular years
30. Astronomic moon : deviation of 6.8 seconds for each lunation representing an error of one day every 1000 years)
31. Equation of time
32. Two additional time-zones
33. Chronograph incorporated with tree column-wheels
34. Instantaneous minutes counter
35. Hours counter incorporated in the mechanism of chronograph, retrograde hand display
36. Fly-back hand mechanism

Total 36 complications,1’483 components & 99 jewels

The glass sapphire case back enables the harmoniously chiselled and decorated pieces that overlap to be admired in a stunning combination as a dazzling ballet. This masterpiece of complications and know how was entirely designed and manufactured by the Franck Muller group and once again demonstrates their vast array of skills and ability in the Art of HAUTE HORLOGERIE.

Technical details

Model: Franck Muller Aeternitas Mega 4
Reference: 8888 MGA T CCR QPSE

Caliber: FM 3480 QPSE
Mechanical movement
Tourbillon, Carillon Westminster on 4 hammers and 4 gongs, Chronograph with fly-back mechanism and only one push-piece, Perpetual Calendar Secular, Equation of time, Two additional time zones, Automatic self-winding mechanism for the movement and the Westminster carillon.
Power Reserve: Movement: 3 days; Chime: 24 Hours
Frequency:18’000 Alternances per hour.
Dimensions of the movement:34.40 x 41.40 ,Height 13.65
Number of movement components: 1483
Number of Jewels:99
Number of wheels:91
Movement decoration: Côtes de Genève, diamond polishing, hand-bevelling, circular graining, bi-colour rhodium-plating and hand-engraving.

Hours, Minutes, 24 hours, Chronograph, Fly-back, Minutes counter, hour counter retrograde, two time zones, Movement power reserve.
Display of the chime: Grande or petite chime. Chime or silence. Chime power reserve.
Perpetual calendar display: Date retrograde, Day, Month, Year, Leap year (cycle of 4 years), no leap year (cycle of 100 years), leap year (cycle of 400 years), Equation of time.

Winding-shaft with 2 positions.
7 push-pieces.
4 correctors

Sun-stamped translucent lacquered white dial.

Cintrée Curvex 8880, 18 karat white gold.
Width: 42.00 mm x Length: 61.00 mm x Height: 19.15mm

Hand-sewn alligator

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