A fake IW371629 is a counterfeit of the IWC Portugieser Chronograph reference IW371629, a 41 mm stainless steel chronograph with two subdials and an in-house column-wheel movement. The fastest way to identify one is to check the movement and the subdial layout: the genuine watch runs IWC calibre 69355 with chronograph registers at 12 and 6 o'clock, while most counterfeits hide a third-party or Chinese chronograph movement with a different register position, rougher finishing, or the wrong beat rate.

What is the IW371629?

The IW371629 sits in the Portugieser Chronograph family, IWC's classic 41 mm two-register chronograph with a clean dial, applied numerals, and feuille leaf-shaped hands. The case measures about 41 mm across and roughly 13 mm thick, with sapphire crystals on the front and the display back.

Current production references in this line use the in-house calibre 69355, a column-wheel chronograph with a 46-hour power reserve and a 4 Hz beat rate. Because the reference is popular and the dial looks simple, it is a frequent target for counterfeiters.

How do you tell a fake IW371629 from a genuine one?

Work through these six checks in order. The first two catch the majority of low-tier and mid-tier fakes.

1. Movement and subdial layout

The real watch has chronograph registers at 12 and 6 o'clock and nothing else. Many fakes are built on a Valjoux 7750 style movement, which forces a small seconds subdial at 9 o'clock and often adds a day or date window. If you see a third subdial or a date aperture at 3, the watch does not match the reference.

2. Dial printing and indices

Genuine applied numerals are polished, raised, and set at an even height, and the minute track is uniform around the whole dial. Under a loupe, the IWC Schaffhausen signature is sharp and correctly spaced, while fakes show fuzzy edges, uneven letter spacing, and flat or poorly polished markers.

3. Case and caseback engraving

Authentic engraving is crisp and consistent, with the reference number, serial number, and brand text in the same font family and depth. The sapphire display back should reveal a decorated movement with striped finishing, circular graining, blued screws, and a signed rotor.

4. Hands, crystal, and anti-reflective coating

Feuille hands have a true leaf profile with polished bevels that catch light along the center ridge. Genuine sapphire with dual-sided anti-reflective coating shows a faint blue or purple tint at an angle, while cheap fakes look flat and reflect more light.

5. Crown, pushers, and winding feel

The chronograph pushers should start, stop, and reset with a firm, even click, and the reset should snap the hands back to zero in one motion. Mushy pushers, a gritty crown, or a rotor that rattles when the watch is tilted point to a counterfeit.

6. Papers, price, and provenance

A genuine steel Portugieser Chronograph sells in the high four figures at retail on a leather strap, so an offer at a small fraction of that is a counterfeit. Check the warranty card, box, and serial match, since genuine watches carry an IWC service record.

Why do replica IW371629 watches vary so much in quality?

Replicas fall into rough tiers. Budget versions get the case proportions, crown guards, and dial print wrong. Mid-tier versions copy the dial but keep an incorrect movement and a thicker case. The closest versions clone the movement architecture and dial details, yet still differ in case finishing, lume, strap hardware, and engraving depth.

Quick authenticity checklist

• Subdials at 12 and 6 only, with no 9 o'clock seconds hand and no date window.
• Case about 41 mm wide and 13 mm thick, not noticeably taller.
• Sharp dial printing with even spacing and polished applied numerals.
• Crisp pusher action and a clean reset to zero.
• Sapphire display back with a decorated, signed movement.
• Reference and serial numbers matching between the caseback and the paperwork.

Is a fake IW371629 worth buying?

A counterfeit carries no IWC warranty, cannot be serviced by an authorized IWC workshop, and holds close to zero resale value. Selling counterfeit goods is illegal in the United States and the European Union, so treat any deal as a purchase of a look and not an asset.

Does the IW371629 have a date?

No. The reference uses two chronograph registers and no date window, so a visible date is a strong sign of a counterfeit or of a different reference.

Can a watchmaker spot a fake IW371629?

Yes. Once the caseback is open, a watchmaker can identify the movement, its finishing, and its beat rate within minutes, and the engraving quality on the caseback is easy to compare against a known genuine example.