A fake IW371427 almost always fails on the movement and the caseback, not the dial. The reference sits inside IWC's Portugieser Chronograph family, where genuine watches run a heavily modified or in-house chronograph caliber with a signed rotor and deep, crisp engraving. Counterfeits usually pair a generic chronograph module with shallow caseback etching, mismatched subdial spacing, and pushers that feel mushy instead of crisp.

What Is the IWC IW371427?

The IW371427 is a Portugieser Chronograph reference belonging to the 3714-derived line, known for a roughly 40.9 mm steel case, a bicompax dial with subdials at 12 and 6, and feuille hands. Reference numbers inside this family shift for dial color, strap, and regional editions while the core architecture stays the same.

Because the family shares one recognizable silhouette, counterfeiters target it heavily. That is exactly why authentication focuses on details that are expensive to copy: applied indices, double-sided anti-reflective sapphire, and the chronograph movement itself.

What Gives a Fake IW371427 Away Fastest?

• Movement and rotor: Genuine Portugieser chronographs use an IWC-signed caliber with a decorated rotor. Fakes show a bare, roughly finished base movement or a rotor with shallow, incorrect lettering.
• Subdial spacing: The two subdials sit widely spaced and perfectly centered on the vertical axis. Clones often look compressed because the donor movement has different pivot positions.
• Crystal and AR coating: Real sapphire is anti-reflective on both faces, so the dial nearly disappears at an angle. Cheap fakes throw a blue or purple sheen.
• Caseback engraving: Reference, serial, and caliber text is laser-deep and sharp on a genuine caseback. Fakes use shallow etching that washes out under a loupe.
• Pushers and winding: Chronograph pushers should start and reset with a defined click. Mushy pushers or a rattling rotor are the two most common in-hand tells.
• Dial printing: The minute track, IWC wordmark, and Schaffhausen text are razor sharp with no ink bleed. Fakes run slightly thicker and unevenly spaced.

How Do Super Clones Compare to the Genuine Reference?

High-end replicas of this reference have moved past the obvious tells. Top-tier versions copy the case profile, dial depth, and subdial recess, and many run a genuine-spec chronograph movement that mimics the pusher feel.

They still fall short in three areas: finishing under the rotor, the exact weight and polish of the applied indices, and long-term chronograph stability. Expect the case and dial to convince from a short distance, and the movement to be the part that never quite matches.

Should You Authenticate Before You Buy?

Yes, and the cheapest route is a qualified watchmaker with the caseback off. Anyone can photograph a dial, but only a movement inspection confirms what you are holding.

A service invoice from an authorized IWC center, matching reference and serial numbers, and original box and papers cut risk sharply on the secondary market. Note that replica watches are restricted or illegal to import in some countries, so check local rules first.

Frequently Asked Questions

Is the IW371427 still in production?

Specific reference numbers come and go as IWC revises dial colors and straps. Availability depends on the edition, so check the current catalog instead of assuming a reference is retired.

What serial number should a real IW371427 have?

Genuine serials follow IWC's numbering by production year, but a serial alone proves nothing because fakes copy them. Match the serial to the caseback engraving, the movement, and any paperwork.

Why do fake IW371427 watches look so close in photos?

Photos hide weight, pusher feel, and movement finishing, which are the three hardest things to counterfeit. A dial that looks identical online can feel clearly wrong in hand.

How much does a super clone IW371427 cost?

Top-tier replicas sell for a small fraction of the genuine watch's secondary-market price, with the gap going into the case, dial, and movement grade. Price alone is not a quality signal, so ask which factory and which movement the seller is using.