The IWC Portugieser Chronograph Ceratanium (reference IW371631) takes the familiar Portugieser chronograph layout and renders it in black: Ceratanium for the case, crown and pushers, with a black dial, black details and a textured rubber strap. Launched on 26 February 2026 as a limited edition of 1,500 pieces, it pairs that stealthy treatment with IWC’s automatic calibre 69355 and a stated 46-hour power reserve.
What is the IWC Portugieser Chronograph Ceratanium?
It is an all-black version of the Portugieser Chronograph, identified by IWC as reference IW371631. IWC says the Portugieser Chronograph dates to 1998; its characteristic arrangement places the chronograph minutes and running seconds in two vertically aligned subdials, with an inner quarter-second scale. On this edition, Arabic numerals, indices and the scale are black-on-black details, described by IWC as discreet elevations on the dial. The black rubber strap has a square texture. The model was announced on 26 February 2026 in a limited run of 1,500 pieces. IWC’s launch release describes it as the first all-black Ceratanium version of the Portugieser Chronograph.
Why use Ceratanium?
IWC describes Ceratanium as a special titanium alloy fired at high temperature in a kiln. The brand says the resulting material combines titanium’s lightness and robustness with hardness and scratch resistance similar to ceramic, while retaining a dark metallic finish. IWC’s product page says the finish does not need an additional coating. These are the manufacturer’s material descriptions, not independent durability test results; they should not be read as a claim that the watch is scratch-proof or indestructible. IWC’s product page gives further detail on the material and watch.
What are the specifications?
The figures below are IWC’s published specifications, not independently measured results. The current international product page lists the case height as 13 mm; the launch sheet dated 26 February 2026 gives 13.1 mm, so the two published figures are shown separately.
#1 Best Overall
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| Specification | IWC listing |
|---|---|
| Reference | IW371631 |
| Case | Ceratanium; 41 mm diameter |
| Height | 13 mm on the current product page; 13.1 mm in the 26 February 2026 launch sheet |
| Dial and strap | Black dial; black rubber strap with square texture |
| Water resistance | 3 bar |
| Crystal and caseback | Convex sapphire crystal with antireflective coating on both sides; synthetic sapphire caseback |
| Strap and buckle widths | 20 mm strap width; 18 mm buckle width |
| Movement | IWC-manufactured calibre 69355, automatic mechanical chronograph; 4 Hz (28,800 vph), 27 jewels |
| Power reserve | 46 hours |
| Functions | Chronograph minutes and seconds; small hacking seconds |
| Edition | Limited to 1,500 pieces |
Specifications are from the current IWC product page and the dated launch sheet.
What does calibre 69355 bring?
Calibre 69355 is an automatic chronograph movement manufactured by IWC. Its column-wheel control organizes the chronograph’s switching phases; IWC says this gives defined operation and tactile feedback. The launch material also describes an automatic double-pawl winding system. IWC presents robustness, reliability and longevity as design aims, rather than reporting independent tests of those qualities.
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- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
How much does the IW371631 cost?
The official sources cited here do not establish a current price or remaining stock. Both can vary by market and date, so check IWC or an authorized local retailer for current availability and regional pricing.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
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- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Rank #3
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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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