There is a version of the all-black watch that reads as a design trend — a finish applied opportunistically to an existing model to generate a new reference number. And then there is a version that actually makes a case for itself. IWC Schaffhausen’s new Portugieser Chronograph Ceratanium® (Ref. IW371631), limited to 1,500 pieces, falls into the latter category, and the reason comes down almost entirely to the material.

The Portugieser Chronograph has been a constant in IWC’s line-up since 1998, and its appeal has always rested on a particular formal clarity: two vertically arranged subdials, an inner flange with a quarter-second scale, applied Arabic numerals, and a case proportion that sits at 41mm — large enough to read as a statement without tipping into excess. It is a design that has aged well precisely because it does not try very hard. The new Ceratanium® version does not change any of that. What it does is strip away the visual contrast entirely, leaving only the geometry.

The material deserves explanation, because “black watch” covers a broad spectrum of execution — from DLC coatings of varying durability to PVD treatments that chip and wear with use. Ceratanium® is a proprietary IWC development and it works differently. The base is a special titanium alloy; the transformation happens in a kiln, where the material is fired at high temperatures in a process that produces a surface with ceramic-like hardness and scratch resistance while retaining titanium’s characteristic lightness. The dark, metallic finish that results is intrinsic to the material rather than applied on top of it.

“With its clean, pure and timelessly relevant aesthetic, the Portugieser Chronograph has captivated me from the beginning. I am excited to combine this unique design with Ceratanium®, one of our most significant material innovations. The all-black execution is different from anything we have ever done before. It emphasises the chronograph’s mere shape, ensuring that nothing distracts the eye from its distinctive silhouette.”

Christian Knoop, Creative Director at IWC Schaffhausen

That last point is the honest rationale for the exercise. On a conventional Portugieser Chronograph, the contrast between dial, indices, and case gives the eye a hierarchy to follow. Here, with the case, crown, pushers, dial, appliques, and hands all rendered in black, that hierarchy collapses. What remains is pure form — the outline of the subdials, the arc of the flange scale, the proportions of the case — which turns out to be more than enough to look at.

Powering the watch is IWC’s in-house calibre 69355, visible through a sapphire caseback. It is a movement with a track record — the column-wheel chronograph mechanism provides clean, defined switching action with tactile pushbutton feedback, and the automatic double-pawl winding system builds a 46-hour power reserve. The movement operates at 28,800 vph (4 Hz) and carries 27 jewels. These are not headline-grabbing specifications, but they represent a solid, dependable mechanical chronograph engineered for longevity rather than showmanship. IWC has long held that a chronograph movement should be robust and intuitive first — the 69355 reflects that engineering philosophy, and it is a sensible match for a watch whose entire aesthetic argument rests on understatement. The sapphire caseback means the movement is on display, but even here the all-black dial side sets expectations appropriately: this is not a watch that courts attention from across the room. It rewards the person wearing it.

The rubber strap, in matching black with a square-pattern texture, closes the composition and is secured by a Ceratanium® pin buckle — a detail that matters more than it might seem. A standard steel or titanium buckle would introduce a tonal break that the rest of the design carefully avoids, so the consistency here is considered rather than incidental. The overall case height sits at 13.1mm, which is not thin by contemporary standards but wears comfortably given the lightness of the Ceratanium® case. Water resistance is rated to 3 bar — sufficient for everyday exposure but not a dive watch, which is appropriate for a piece that sits firmly in the dressed-sport category the Portugieser has always occupied.

What the Ceratanium® material ultimately adds to the ownership equation, beyond aesthetics, is durability without weight penalty. A ceramic watch of similar scratch resistance would be heavier and more brittle; a titanium watch would be lighter but would show wear on its surface over time. Ceratanium® threads that needle, and in a limited edition of 1,500 pieces, it does so on one of the more enduringly well-designed chronograph dials in the Swiss industry.

The Portugieser Chronograph Ceratanium® is limited to 1,500 pieces and is available through IWC boutiques and authorised retailers worldwide.

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Visuals by IWC Schaffhausen