The IWC Ingenieur Perpetual Calendar 41, reference IW344903, adds a perpetual calendar to the modern Ingenieur collection. Presented at Watches & Wonders 2025, it pairs a 41.6 mm steel case and integrated bracelet with a blue grid-pattern dial and a Kurt Klaus calendar module. Monochrome Watches’ first-look article includes an embedded video alongside its specifications and design discussion.
What is the IWC Ingenieur Perpetual Calendar 41?
IW344903 is a stainless-steel complication introduced in 2025. Monochrome Watches described it as the first complication to join the Ingenieur family since the collection’s 2023 redesign. Its defining combination is the modern Ingenieur’s integrated-bracelet design and a perpetual calendar, a complication more closely associated with IWC’s Kurt Klaus calendar work.
The watch draws visual cues from the 1976 Ingenieur SL Jumbo Automatic 1832, a 40 mm integrated-bracelet design credited to Gérald Genta, as well as the 2023 redesign. It is not presented as a faithful reproduction of the 1976 model.
How does the perpetual calendar display work?
Three subdials divide the calendar information across the dial. At 9 o’clock, one subdial shows the weekday and leap-year indication; at 3, the date; and at 6, the month alongside the perpetual moon phase. The watch has hours and minutes, but no seconds hand.
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#1 Best Overall
- Model IW391031
Monochrome attributes the calendar module to Kurt Klaus and reports that it contains 81 parts. The article says all indications can be adjusted via the crown. It also reports that the calendar requires a correction in 2100. These are specifications and explanations reported in that 2025 article, not independently verified performance claims.
Moon-phase precision
The first-look article states that the moon-phase display deviates by one day after 577.5 years. That is the source’s stated precision figure; it should not be read as an independently tested result.
Rank #2
- Brand new top quality, easy to adjust the length to fit the wrist, one size fits all.
- Material: High Density Nylon , Sweat and Breathable environmentally friendly and healthy, moderate softness, very comfortable to wear.
- Moderate softness, very comfortable to wear, molded, strong and durable, wear-resistant strap/wristband, suitable for original watch.
- There are tools included in the package to help you easily insert and remove the strap, perfect for you to modify your watch.
- Exquisite packaging with exquisite workmanship and stylish design is a perfect gift for friends and family.
Case, dial and bracelet
The steel case measures 41.6 mm in diameter and 13.4 mm thick. Its surfaces combine satin brushing and polishing, and the bezel has five functional screws. A convex sapphire crystal with anti-reflective coating on both sides sits above the dial; the caseback is also sapphire. The screw-down crown is protected by crown guards, and the reported water resistance is 100 m.
The blue dial has a negative-relief grid pattern and three matching blue subdials. Hand-applied indices and rhodium-plated hands use Super-LumiNova. The integrated steel H-link bracelet combines brushed and polished finishes and closes with a butterfly folding clasp. Monochrome notes that the clasp has no micro-adjustment.
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- Brand new top quality, easy to adjust the length to fit the wrist, one size fits all.
- Material: High Density Nylon , Sweat and Breathable environmentally friendly and healthy, moderate softness, very comfortable to wear.
- Moderate softness, very comfortable to wear, molded, strong and durable, wear-resistant strap/wristband, suitable for original watch.
- There are tools included in the package to help you easily insert and remove the strap, perfect for you to modify your watch.
- Exquisite packaging with exquisite workmanship and stylish design is a perfect gift for friends and family.
Movement and specifications
| Specification | IW344903 |
|---|---|
| Reference | IW344903 |
| Case | Stainless steel; 41.6 mm diameter, 13.4 mm thick; satin-brushed and polished; five functional bezel screws |
| Crystal and caseback | Convex sapphire crystal with anti-reflective coating on both sides; sapphire caseback |
| Water resistance | 100 m; screw-down crown |
| Dial | Blue negative-relief grid; three blue subdials; hand-applied indices; rhodium-plated hands with Super-LumiNova |
| Movement | IWC calibre 82600, automatic Pellaton winding with ceramic components; 46 jewels; 28,800 vibrations per hour |
| Power reserve | 60 hours |
| Displays | Hours, minutes, weekday, date, month, leap year and perpetual moon phase; no seconds hand |
| Bracelet | Integrated steel H-link bracelet; butterfly folding clasp without micro-adjustment, as reported by Monochrome Watches |
These specifications are reported by Monochrome Watches’ 1 April 2025 first look. The article identifies calibre 82600 as an automatic movement with Pellaton winding and ceramic components, and gives a 60-hour power reserve.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Launch price and availability
Monochrome reported a launch price of EUR 40,900 in its 2025 coverage. That is a launch figure, not a confirmed current price or a universal price across markets. Current stock, regional availability and retailer pricing are not established by the cited article.
Quick Recap
Best Value
- Brand new top quality, easy to adjust the length to fit the wrist, one size fits all.
- Material: High Density Nylon , Sweat and Breathable environmentally friendly and healthy, moderate softness, very comfortable to wear.
- Moderate softness, very comfortable to wear, molded, strong and durable, wear-resistant strap/wristband, suitable for original watch.
- There are tools included in the package to help you easily insert and remove the strap, perfect for you to modify your watch.
- Exquisite packaging with exquisite workmanship and stylish design is a perfect gift for friends and family.
Rank #4
- Brand new top quality, easy to adjust the length to fit the wrist, one size fits all.
- Material: High Density Nylon , Sweat and Breathable environmentally friendly and healthy, moderate softness, very comfortable to wear.
- Moderate softness, very comfortable to wear, molded, strong and durable, wear-resistant strap/wristband, suitable for original watch.
- There are tools included in the package to help you easily insert and remove the strap, perfect for you to modify your watch.
- Exquisite packaging with exquisite workmanship and stylish design is a perfect gift for friends and family.
