A fake IW371418 gives itself away first in the subdial layout, the case finishing, and the caseback engraving. A genuine IWC Portugieser Chronograph of this generation runs small seconds at 6 o'clock and the chronograph minute counter at 12, so the two registers sit stacked on one vertical line. Counterfeits often rearrange that layout, hide a quartz module behind a decorated plate, or leave the caseback engraving shallow.
The phrase "fake IW371418" gets used for two different products. One is a counterfeit sold as a genuine IWC, which is fraud. The other is an openly labeled replica built to a stated quality tier. This guide covers how to tell them apart and how to check the details that matter most.
The Reference at a Glance
The IW371418 sits in the IWC Portugieser Chronograph family, a line defined by a round stainless steel case of roughly 41 mm, a wide clean dial, and leaf-shaped feuille hands. The case mixes brushed and polished surfaces, the crystal is sapphire with an anti-reflective coating, and the back is a sapphire display window over the movement.
The dial carries applied Arabic numerals, a thin minute track, and the IWC Schaffhausen signature below 12. Water resistance in this family is modest, so treat it as a dress watch rather than a sports watch.
How to Spot a Fake IW371418
Work through these points in order. The first two or three will settle most questions.
- Subdial function. Confirm that running seconds sit at 6 and chronograph minutes at 12. A 6-9-12 arrangement, a 3-6-9 arrangement, or a dead subdial means the watch is not built to the reference.
- Case finishing. Genuine brushing runs in one consistent direction across the lugs, and the polished bevels are sharp where they meet the brushed flats. Fakes show rounded transitions and scattered brush lines.
- Dial and numerals. Applied numerals should be raised, polished on the bevel, and set level. Fuzzy printing, flat painted numerals, or uneven spacing around the minute track are common on counterfeits.
- Hands. Feuille hands are faceted and taper to a point. They should reach the minute track without overhanging it, and the facets should flash light as the watch turns.
- Crystal. The anti-reflective coating adds a faint tint when you tilt the watch. No coating at all, or a heavy purple wash, is a warning sign.
- Caseback engraving. Reference and serial numbers should be cut deep, crisp, and evenly spaced. Laser etching that looks pale or shallow is typical of fakes.
- Crown and pushers. The chronograph pushers should click firmly and start the central hand with a smooth sweep. Gritty pushers, or a chronograph that stalls the running seconds, point to a cheap module.
- Weight and feel. A steel case has a cool, dense feel in the hand. A base-metal case plated to look like steel feels light and warms up fast.
Why the Movement Is the Hardest Detail to Copy
Mechanical chronographs with this subdial layout are costly to reproduce, so counterfeiters take shortcuts. The clearest tell is the central chronograph hand. On a mechanical movement it sweeps in small increments and snaps back to zero when you reset it. On a quartz fake it ticks once per second and resets with a visible twitch.
Look at the movement through the display back as well. Striped or circular graining, blued screws, and a signed rotor should look like metal that has been cut and finished. Printed patterns and stamped plates do not shift as the light moves across them.
If the watch has a date aperture, check that it changes cleanly and sits centered in the window. A date that drifts toward the edge is a common fault on low-grade copies.
Caseback, Strap, and Paperwork
Documentation carries as much weight as the watch. The reference and serial on the caseback should match the warranty card or service papers, and a service record from an authorized center is the strongest verification you can get. Leather straps and buckles are engraved with care as well, and the stitching on the strap should be even and tight.
Price is the loudest signal of all. If a stainless steel Portugieser Chronograph is offered far below the going secondary-market range, with no papers and a seller who avoids authentication, treat the deal as the warning. A seller who refuses a third-party inspection is telling you something.
Replica, Homage, or Counterfeit
An openly labeled replica is a different product from a counterfeit passed off as genuine. Reputable replica sellers state the movement type, case material, dimensions, and finishing tier before you buy, and they do not claim the watch is an IWC. That transparency is what separates a buyer's choice from a bait-and-switch. If you want the look of a Portugieser Chronograph without the price of a genuine piece, buy from a seller who describes the item honestly and stands behind it.
Quick Checklist
- Subdials at 12 and 6, running seconds at 6.
- Consistent brushing and sharp polished bevels.
- Raised applied numerals with clean printing.
- Faceted feuille hands that reach the minute track.
- Sweeping central chronograph hand with a firm reset.
- Deep caseback engraving that matches the papers.
- A seller willing to allow authentication.
Run those seven checks and a fake IW371418 rarely survives to the third one. Details decide these purchases, and the details are all visible if you know where to look.