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The Franck Muller Aeternitas Mega 4 combines striking mechanisms, a split-seconds chronograph, two second-time-zone displays and an eternal calendar in an 18K white-gold case measuring 42.1 × 61 mm. Franck Muller Japan lists 36 functions for the watch, while the brand’s history describes the model as having 36 complications. This is a specification-led look, not a firsthand review: the available official material does not establish how the watch wears, sounds or operates in practice.
What the Aeternitas Mega 4 does
Franck Muller’s published feature list centers on several groups of functions. It names grand sonnerie and petite sonnerie, a selectable sonnerie on/off function, a minute repeater, two second-time-zone displays and a split-seconds chronograph. The Japan product page calls the watch’s total 36 functions; the brand’s history uses the term 36 complications. Those are the manufacturer’s counts and terminology.
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Chiming functions
The listed chiming features are grand sonnerie, petite sonnerie and a minute repeater, alongside a selectable sonnerie on/off function. A repeater is a mechanism for chiming the time on demand; the product page establishes that the Aeternitas Mega 4 has one, but does not provide an operating procedure or a firsthand account of its sound. The available specification also does not explain how the selectable setting is engaged.
Time-zone displays
The maker lists two second-time-zone displays. Its published material does not specify their setting procedure or provide further operating detail, so the feature can be identified but not assessed here for ease of use.
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- Built from Mega Man 2 Authentic sprites, stages, bosses, and music rebuilt for your wrist
- Multiple Game Modes Classic Mode with full stage progression + Dr. Wily’s Castle, Arcade Mode for endless, high-score gameplay plus Play Time animated watch faces
- One-Touch Action Gameplay Auto-run platforming with rapid tap shooting and tap-and-hold jumping
- Quick Play Sessions Stages designed for fast gameplay (typically under 1 minute per run)
- Save Progress + High Scores Continue your Classic Mode run or compete for your best Arcade score
Split-seconds chronograph
The chronograph specification names three column wheels, a snap-action minute counter and a retrograde hour counter. These are construction and display details supplied by Franck Muller; they do not establish how the chronograph feels to operate or how clearly its indications can be read.
Eternal calendar
Franck Muller describes the eternal calendar as following a 1,000-year cycle that is renewable to infinity. That is the maker’s description of the calendar; the cited collection material does not independently verify its mechanics, operation or performance.
Case, components and official specifications
Franck Muller Japan’s undated product page, accessed in 2026, identifies the listed watch by product number 8888TGSCCRQPSE OG. It specifies an automatic watch in 18K white gold, with case dimensions of 42.1 × 61 mm, 1,483 components and 99 jewels. The page does not state the publication date of these specifications.
The dimensions convey the scale of the listed case, but they do not establish how it sits on a wrist. Fit, comfort, legibility and wrist presence have not been verified here.
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- Power Reserve: Approximately 42 hours
What the brand says about its history
Franck Muller’s official World Premieres history says the Aeternitas Mega was presented in 2007 after five years of research and development. This is the brand’s account of the model’s history, rather than an independently audited development record.
Price on the official Japan listing
Franck Muller Japan displayed a tax-inclusive price of ¥649,000,000 for product number 8888TGSCCRQPSE OG on its page accessed in 2026. This is the figure shown for that listing, not a verified global price or a live quote for another market. Availability and listed prices can change.
What a specification page cannot establish
The official material documents an unusually broad set of functions and construction figures, but it does not substitute for hands-on evaluation. It does not establish the watch’s sound in person, readability, comfort, setting process, service requirements or current availability. Those practical questions remain unanswered by the product and history descriptions cited here.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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