The IWC Portugieser Chronograph CERATANIUM® 41mm IW371631 redefines an icon in striking all-black form. Crafted entirely from Ceratanium®, IWC Schaffhausen’s proprietary material, this limited-edition chronograph blends the lightweight strength of titanium with the hardness and scratch-resistance of ceramic, resulting in a bold, matte-black finish with exceptional durability.

A modern interpretation of one of the manufacture’s most celebrated designs, this timepiece preserves the unmistakable Portugieser aesthetic. The balanced dial layout features two vertically aligned sub-dials and a refined inner flange with a quarter-second scale, ensuring precise chronograph readings while maintaining elegant symmetry. Discreet black appliqués, Arabic numerals and hands rise subtly from the deep black dial, enhancing legibility while reinforcing the watch’s contemporary, monochromatic character.

Housed within a 41mm Ceratanium® case, crown and pushers, the IW371631 offers both resilience and comfort on the wrist. The material undergoes a specialised high-temperature firing process, creating a distinctive dark metallic tone that is integral to the structure itself - not simply a surface coating. The result is a timepiece engineered to withstand daily wear while retaining its refined aesthetic.

At its heart beats the IWC-manufactured 69355 calibre, a robust automatic chronograph movement designed for reliability and longevity. Featuring a precise column-wheel mechanism, it delivers crisp, tactile feedback when activating the chronograph functions. The double pawl winding system efficiently builds a power reserve of approximately 46 hours, ensuring consistent performance.

Completing the stealth-inspired design is a black rubber strap with a distinctive square pattern, offering both comfort and a contemporary sporting edge.

Limited to 1,500 pieces worldwide, the IWC Portugieser Chronograph CERATANIUM® 41mm IW371631 represents a rare opportunity to own a bold evolution of a timeless classic. With its fusion of advanced materials, technical excellence and unmistakable design heritage, this model stands as a compelling choice for collectors and enthusiasts seeking modern luxury with enduring appeal.