The short answer

A replica IW371629 is not a shortcut to the watch. Counterfeit Portugieser Chronographs range from crude to convincing, but every one of them is a trademark-infringing copy, and importing or reselling one can get the watch seized while leaving the buyer with no legal recourse and no service path. If what you want is the look and feel of this reference, the durable options are a genuine used example or a legitimate homage from a brand that does not trade on IWC's name. This guide covers the genuine watch and the specific details that separate it from a fake, so you can pay real money for a real watch and never the other way around.

What the IW371629 actually is

The reference sits inside the IWC Portugieser Chronograph family, a line IWC has produced in several generations and in a large number of dial, case, and strap combinations. Because so many variants share near-identical reference stems, the first task for any buyer is to confirm the exact configuration tied to the number you are chasing: case metal, dial colour, hands, strap or bracelet, and the movement generation. IWC publishes those details against each reference, and the case back engraving on the watch itself should match what the manufacturer lists. If a seller cannot show you a case back photo that lines up, stop there.

What to look for in a genuine example

  • Case and crystal: crisp lug geometry, even brushing, sharp polished bevels, and a sapphire crystal that sits flush. Soft or rounded lugs usually mean heavy polishing or a counterfeit case.
  • Movement: the modern 41 mm generation uses IWC's in-house calibre 69355, while the earlier 3714 generation used the 79350. Ask which one applies to your reference and expect the answer to match the case back.
  • Dial: applied numerals and indices with clean edges, a railway-track minute ring that is evenly printed, and subdial hands that sit at the correct height above the dial.
  • Case back: engraving with the reference number, serial, and IWC wordmark. Compare it letter by letter against a manufacturer image.
  • Box and papers: a matching card or guarantee booklet, plus service receipts, tells you the watch has a documented life rather than a story.
  • Seller: a dealer or platform with authentication on file, a return window, and a written description of condition.

Parameter bands to check

  • Case diameter: roughly 40.9 mm to 41.0 mm across the Portugieser Chronograph generations. A caliper reading well outside that band is a warning.
  • Case height: about 12.3 mm on the older 3714 generation and about 13.1 mm on the current 41 mm generation.
  • Lug width: 20 mm, so straps and bracelets should seat without gaps at the lugs.
  • Water resistance: 3 bar, which is splash resistance only. Anyone describing a Portugieser chronograph as a dive watch is selling you something else.
  • Power reserve: about 44 to 46 hours depending on movement generation.
  • Frequency: 28,800 vibrations per hour, or 4 Hz, on both generations.

Treat these as bands to verify, not as absolutes. Pull the official specification for your exact reference and measure against it.

Pitfalls

  • Fake sold as genuine: the most expensive outcome. A counterfeit purchased at authentic pricing is a total loss with no warranty and no recourse.
  • Frankenwatches: genuine case, aftermarket dial, or a swapped movement. Individually plausible parts that do not belong together.
  • Reprinted or refinished dials: look for fuzzy printing, misaligned markers, and lume that does not match the hands.
  • Super clone marketing: claims about Swiss movements in counterfeit watches are advertising, not specification. No replica carries an IWC calibre, and independent watchmakers generally will not touch them.
  • Customs exposure: counterfeit goods are subject to seizure when imported, and the shipment is simply gone.
  • Deals that beat the market by a wide margin: the usual explanation is that the watch is not what it claims to be.

FAQ

Is a replica IW371629 worth buying?

No, and not only for legal reasons. A counterfeit has no service network, no parts support, no resale value you can rely on, and it can be seized in transit. The money is gone the moment you spend it.

How can I tell a fake Portugieser Chronograph from a real one?

Start with the case back engraving and the movement. Match the reference number against the manufacturer's own listing, have a watchmaker open the case, and compare dial printing and hand finishing under magnification. Authentication is a physical inspection, not a photo review.

What does the reference number tell me?

It identifies a specific configuration rather than a whole model. Two watches that look similar on a listing page can carry different references and different movements, so always confirm the number against the official specification.

Can a replica be serviced later?

Rarely, and never by the brand that made the original. Independent watchmakers often decline counterfeit work outright, and generic replacement parts rarely fit properly, which is why counterfeits tend to become paperweights rather than watches.