Description
IWC's biggest news at Watches & Wonders 2026 isn't a new complication — it's a fundamental reinvention of an existing one. The ProSet system transforms how perpetual calendars are adjusted. For the first time in any gear-based perpetual calendar, all displays are fully synchronized and can be adjusted both forward and backward using only the crown. No pusher tools. No single-direction-only limitation. The flagship expression is this 43mm white ceramic Le Petit Prince edition with a deep blue dial.
Design
The 43mm white zirconium oxide ceramic case is sleek and modern, contrasting beautifully with the deep blue sunburst dial. The subdials are harmoniously laid out — day and month flanking the date, with a moon phase at 12 o'clock accurate to one day in 1,040 years. Rhodium-plated hands and white printed indices provide excellent legibility. The titanium caseback features the Le Petit Prince engraving, and the white rubber strap with EasX-CHANGE system completes the package.
Specifications
- Reference: IW339601
- Case: White zirconium oxide ceramic, 43mm diameter, 14.3mm thick
- Water resistance: 100m (10 bar)
- Movement: IWC calibre 82665 (in-house, automatic)
- Frequency: 28,800 vph (4 Hz)
- Power reserve: 60 hours
- Complications: ProSet perpetual calendar (day, date, month, 4-digit year, moon phase)
- Moon phase accuracy: 1 day in 1,040 years
- Dial: Deep blue with sunburst gradient
- Strap: White rubber with EasX-CHANGE system
- Caseback: Sapphire with Le Petit Prince engraving
- Special features: Bidirectional calendar adjustment via crown, nickel-phosphorus escapement, silicon hairspring
- Price: CHF 41,200
What's Exciting About This Watch
The ProSet mechanism is genuinely revolutionary. Traditional perpetual calendars can only be advanced forward — if you overshoot, you have to go all the way around again. ProSet uses flexible, extendable, retractable fingers in the gear train that allow fully synchronized backward and forward adjustment. This means if your watch stops and you pick it up three days later, you can quickly set it to the correct date by turning the crown in either direction. No corrector pushers, no watchmaker visits. IWC has solved the perpetual calendar's oldest usability problem. The white ceramic execution with blue LPP dial is the most visually striking of the three ProSet references.
History
IWC's perpetual calendar heritage began with Kurt Klaus in the 1980s, and the brand has continuously refined the mechanism. The ProSet system represents a generational leap — the first time the fundamental adjustment paradigm has changed. The Le Petit Prince partnership celebrates 20 years in 2026, making the timing of this flagship ceramic edition perfectly symbolic. IWC's ceramic expertise, honed over two decades, combines with their most advanced calendar mechanism to date.
