Description
If the white ceramic ProSet is the showpiece, the stainless steel IW329601 is the daily-wear perpetual calendar that makes the ProSet technology accessible. At 42mm on a 5-link steel bracelet with an additional blue rubber strap included, this is IWC's most wearable Big Pilot perpetual calendar to date. It carries the same revolutionary bidirectional adjustment mechanism as the ceramic and gold siblings.
Design
The 42mm stainless steel case is compact for a Big Pilot QP — a full millimeter smaller than the ceramic version. The deep blue sunburst Le Petit Prince dial maintains the collection's signature look. The 5-link steel bracelet with butterfly folding clasp gives it a sporty-elegant character, and the included blue rubber strap with EasX-CHANGE system offers versatility. The sapphire caseback reveals the calibre 82665 with its gold-plated Little Prince rotor medallion.
Specifications
- Reference: IW329601
- Case: Stainless steel, 42mm diameter, 14mm 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
- Bracelet: 5-link stainless steel + blue rubber strap (EasX-CHANGE)
- Price: CHF 38,700
What's Exciting About This Watch
This is the value play in the ProSet lineup — and what a value it is. A fully in-house perpetual calendar with revolutionary bidirectional adjustment, on a steel bracelet, for under CHF 40,000. The 42mm case makes it genuinely wearable for most wrist sizes, and the included rubber strap doubles its versatility. When you compare this to competitors' perpetual calendars at similar price points, the ProSet technology gives IWC a genuine technical edge.
History
The steel-on-bracelet format represents IWC's recognition that perpetual calendars are moving from safe-deposit boxes to daily wrists. The Le Petit Prince partnership turns 20 in 2026, and this steel reference makes the celebration accessible to a broader audience than the ceramic or gold variants.
