A fake IW371734 is a counterfeit copy of an IWC Portugieser chronograph, and the three fastest tells are the movement visible through the sapphire caseback, the sharpness of the caseback engraving, and the crispness of the dial printing. Genuine IWC chronographs use an in-house calibre with distinctive bridge shapes, while copies almost always hide a mass-produced third-party movement behind a decorative rotor plate. If you cannot inspect the movement, treat any IW371734 offered far below market value as counterfeit until an independent watchmaker proves otherwise.
What is reference IW371734?
IW371734 sits inside the IWC Portugieser chronograph family, a line defined by a wide, clean dial, a railway minute track, applied indices, and two subdials. The family has been revised several times since the 1990s, so case size, dial text, and movement differ between references. Before judging any single watch, confirm the exact dial layout, case thickness, and calibre that IWC lists for that reference.
How do you spot a fake IW371734?
Counterfeiters copy the look from three feet away. The details that survive close inspection are the ones that cost real money to reproduce.
1. Movement and rotor
- Genuine calibres show clean perlage, polished bevels, and bridge shapes that match IWC service documentation.
- Rotor engraving is deep, centered, and consistent in font weight, not stamped onto a flat plate.
- Fakes often run a stock chronograph movement under a decorative plate, with rough finishing and sloppy chronograph reset.
- Pushers on a genuine watch feel firm with a clean start, stop, and reset, while copies feel gritty or mushy.
2. Dial, hands, and printing
- Genuine text is crisp under 10x magnification, while counterfeit printing bleeds, doubles, or sits unevenly on the surface.
- Applied indices have sharp polished facets and flat matte sides, while replicas look soft, rounded, or painted.
- Subdial hands reach their tracks exactly, and subdial spacing follows the genuine layout rather than a generic one.
3. Case, crown, and pushers
- Case dimensions and lug curve should match the reference spec, since many replicas reuse a generic case that is thicker or wider.
- Bevels and brushing should be even and sharp, with no rounded edges from over-polishing.
- Crown engraving and pusher threads should be precise, with no wobble when screwed down or pushed.
4. Caseback, serials, and paperwork
Reference and serial numbers should be engraved cleanly and traceable through an IWC authorized service center. Boxes, hang tags, and warranty cards are cheap to fake, so documents alone never prove authenticity. Ask for service history and original purchase records, then verify them independently.
How much does a fake IW371734 cost?
Replica listings typically ask $150 to $600, and sellers inflate that with claims of a Swiss movement or a 1:1 grade. A genuine steel Portugieser chronograph sells for thousands on the secondary market, not hundreds. A price gap that large is the single most reliable red flag.
Why do counterfeiters target this reference?
Large, uncluttered dials are easier to copy than skeletonized or highly complicated ones. The Portugieser look also reads as a dress watch, so a buyer may never compare it side by side with a genuine piece. That combination keeps demand for copies steady.
What should you do if you are offered a fake IW371734?
- Stop the deal and request clear macro photos of the movement, caseback, and dial.
- Ask for service records, then verify the serial number with an IWC authorized service center.
- Have an independent watchmaker open the case before money changes hands.
- Report the listing to the platform, and in the US a knowingly sold counterfeit can also be reported to customs or consumer protection authorities.
Frequently asked questions
Is IW371734 still in production?
IWC rotates references as collections are updated, so availability depends on the current catalog. Check the IWC site or an authorized dealer for live status before assuming a reference is discontinued.
Can a jeweler spot a fake IW371734 instantly?
A trained watchmaker usually can, but only after opening the case and comparing finishing and movement layout. Quick counter checks such as weight or sound are unreliable on their own.
Do replica IW371734 watches use real IWC movements?
No. IWC in-house calibres are not sold loose to third parties, so any counterfeit advertising an original IWC movement either mislabels a clone or hides a stock movement behind a decorative plate.