If you are comparing a fake IW371431 against the other replica options out there, the decision usually comes down to the dial and the case profile rather than the name on the back. The IWC Portuguese Chronograph is a dressy two-register chronograph, and the versions that get it right are the ones that respect its 40.9 mm case, its narrow bezel and the exact placement of the subdials at 12 and 6 o'clock. Our first pick is the automatic version built on a modified Valjoux 7750, because it matches the original's thickness and hand stack far more closely than quartz or oversized alternatives.
Key Features
- 40.9 mm stainless steel case with a slim, gently curved profile
- Silver-plated dial with gold-tone applied Arabic numerals and leaf-shaped hands
- Correct two-register layout: running seconds at 6, 30-minute counter at 12
- Automatic chronograph movement with a smooth, sweeping seconds hand
- Sapphire crystal with anti-reflective coating on both faces
- Engraved solid caseback carrying reference and serial markings
- Black alligator-grain leather strap with a steel pin buckle
- Rated to 30 m water resistance for splash and everyday wear
Materials and Specifications
The case is 316L stainless steel, polished across the lugs and brushed along the flanks, paired with a silver-plated dial, gold-tone applied numerals and leaf hands that catch light the way the original does. The crystal is sapphire with double anti-reflective coating, which is what gives the genuine piece its near-invisible glass, and it is one of the first places cheap versions give themselves away. The movement is an automatic chronograph with a 30-minute counter at 12 and running seconds at 6; because the caseback is solid and engraved, movement decoration matters far less than the feel of the pushers and the sound of the rotor. Water resistance is rated at 30 m, which covers rain and handwashing but not swimming.
Shipping and Returns
Orders are packed discreetly and shipped with tracking, typically leaving the warehouse within a few business days. If the watch does not suit you, returns are accepted within the stated window provided it comes back unworn with the protective film and tags intact, so check the fit and the dial in daylight before you wear it out.
How close is a fake IW371431 to the original?
A good automatic version is convincing at arm's length, especially in case proportions and dial spacing, but it is still a replica and not a genuine IWC. Under a loupe, printing crispness, hand finishing and caseback engraving depth are where the differences show.
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Which version should you pick first?
Start with the modified-7750 automatic on a leather strap, since it delivers the correct thickness, subdial positions and chronograph feel. Only consider quartz or budget automatics if the case profile matters less to you than the outlay.
What should you check before ordering?
Confirm the listed case diameter and thickness, ask for real photos of the exact watch rather than stock images, and check the returns policy. Remember that selling or importing counterfeit goods is illegal in the US, so buy with that distinction clearly in mind.