A genuine IWC Portugieser Chronograph 41 mm has a 41 mm steel case, two vertical subdials, no date window, and the in-house caliber 69355 inside. A counterfeit does not match all four. If a listing shows a date window, a 40 mm or 42 mm case, or a movement you can only see in a filtered photo, stop there. That watch is not a real reference IW3716.

Before you start

Collect these items first. Judging a watch from one photo leads to wrong calls.

  • A digital caliper for case diameter and thickness
  • A 10x jeweler's loupe for printing and engravings
  • A small scale for weight comparison
  • The reference page for the exact model you are checking
  • Contact details for an authorized dealer or a certified watchmaker

Step by step checks

  1. Measure the case diameter. The genuine case measures 41.0 mm across the bezel, without the crown. A 40 mm or 42 mm reading means the case is not the reference it claims to be.
  2. Measure the thickness. The real watch sits at roughly 13 mm. Replica cases built around a third party chronograph module run thicker, often by 1 mm or more.
  3. Check the dial layout. The Portugieser Chronograph has a small seconds hand at 6 o'clock and a 30 minute counter at 12 o'clock. There is no date window on this reference. A date aperture at 3 o'clock is a clear sign of a fake.
  4. Read the printing with a loupe. Look at the brand name, the Schaffhausen line, and the minute track. Real printing has sharp edges and even spacing. Copies show thick strokes, uneven letterforms, and ink that bleeds under magnification.
  5. Inspect the hands and applied markers. Genuine leaf hands are polished on top with beveled edges, and the applied indices are faceted. On fakes the hands look flat, the bevel is missing, and the indices sit high or crooked.
  6. Work the crown and pushers. Winding should feel smooth, and the chronograph start, stop, and reset should snap with firm clicks. A gritty or springy reset points to a low grade module.
  7. Look at the case back. The 41 mm reference shows a sapphire display back and the caliber 69355. Check the reference and serial engraving. On a real watch the characters are crisp and cut into the metal, while on a fake they are shallow, fuzzy, or laser etched on top of the surface.
  8. Weigh the watch. Compare it against a known genuine piece on the same strap type. A shortfall in weight comes from thinner case walls and lower grade components.
  9. Study the price and the paperwork. Genuine examples sell new for about 8,000 US dollars and up. A new watch offered for a few hundred dollars is not a discounted original. Ask for the warranty card, the serial, and the seller's history.

Dial details that give a replica away

Zoom in on the subdials. The two registers should sit on the same vertical line through the center of the dial, with equal spacing from the center. Copies place them a fraction off center, which you can see by drawing a straight edge through the crown and the 12 o'clock marker.

Then check the crystal. A genuine sapphire crystal has anti reflective coating on both faces and shows a faint blue or purple tint at an angle. Mineral glass copies show no tint, scratch under a fingernail test, and throw a heavier glare.

If you already own a suspected fake

  1. Stop wearing or reselling it.
  2. Take it to an authorized dealer or a certified watchmaker for a written opinion.
  3. Keep the listing, receipt, and messages from the seller.
  4. Report the sale to the marketplace and to your local consumer protection office.

Why the check matters

Counterfeit watches are illegal to import and to sell in the United States, and a buyer who passes one on can face a claim from the trademark owner. A short inspection at the counter costs nothing and settles the question. If a seller refuses to meet at a dealer or a watchmaker, treat that refusal as your answer.