A fake IW371427 is a replica of the IWC Portuguese Chronograph, a steel bi-compax watch with a 30-minute counter at 12 o'clock, running seconds at 6, and no date window. The original runs IWC calibre 79350, a reworked Valjoux 7750, inside a case about 12.3 mm thick. Replicas copy the dial layout and case shape, but they use third-party movements, and case height, printing quality, and pusher feel are the fastest ways to tell the tiers apart.
What is the IW371427?
The reference sits in the Portuguese Chronograph line, a series IWC has built for decades. The design keeps the dial clean: applied numerals, feuille hands, two subdials, no date at 3.
Dial color, hands, and strap change across versions within the same reference group. Match the photos in a listing to the version you want before you judge the copy.
- Case: stainless steel, about 41 mm across
- Thickness: about 12.3 mm on the original
- Movement: calibre 79350, automatic chronograph, 28,800 vph, about 44 hours of power reserve
- Crystal: sapphire on the front, sapphire or steel caseback depending on version
- Water resistance: 30 m
- Strap: leather with a steel pin buckle
Which flaws show up on a cheap replica?
Thickness, printing, and pusher feel expose most of the problems. A budget copy runs 1 to 2 mm taller than the original because the movement inside needs more room.
Case and profile
Look at the lug curve and the bezel edge. Originals flow from bezel to lug in a thin, tapered line, while low-tier copies keep the metal thick and blunt. Run a caliper across the case if you can. Anything past 14 mm points to a low grade build.
Dial and hands
Printing on cheap copies smears under a loupe, and the subdial rings sit at the wrong distance from the center. Check the numeral shape and the length of the feuille hands. Hands that stop short of the minute track are a common fault.
Movement and pushers
Press the top pusher. A healthy chronograph starts with a short, crisp click, and the sweep hand jumps once. Grit, a long mush, or a hand that stutters points to a worn or poorly finished movement.
Crystal and caseback
Sapphire throws back a dull reflection with little color. Mineral glass on cheap copies looks blue or purple at an angle. On display casebacks, sharp engraving and a well-finished rotor mark a higher tier.
Fake IW371427 quality tiers
Sellers sort replica stock into rough grades, and the price tracks the grade.
- Low grade: thick case, mineral glass, soft dial printing, noisy movement. Sells for the price of a fashion watch.
- Mid grade: correct width, sapphire crystal, decorated rotor, decent dial. Case height still runs tall.
- High grade: case cut close to the original, better dial printing, smoother pusher action, tighter strap fit. Costs several hundred dollars.
No replica reaches the finish of the real watch. A high grade copy can pass at 2 feet on a wrist, and that is the honest ceiling.
What movement sits inside a replica IW371427?
Most copies run an Asian 7750 clone, the same base architecture as the original. The layout matches because both trace back to the Valjoux 7750 chronograph design.
Differences show in the details. IWC reworks the base movement, swaps parts, and finishes it to a higher standard. Clones ship with rougher gears, a louder rotor, and a wider tolerance for timing drift.
- Beat rate: 28,800 vph on both
- Power reserve: 40 to 44 hours on most clones
- Rotor: decorated on mid and high tiers, plain on low tiers
- Service: hard to source for clones, and many watchmakers refuse the work
How much should a fake IW371427 cost?
Prices split by tier and by seller. Low grade copies sell for under $100. Mid grade runs from about $150 to $350. High grade copies climb past $400 and can reach $700 when the seller claims Swiss parts.
Treat any Swiss made claim on a replica with doubt. Movement swaps exist, but they are rare, and the markup is often pure profit for the seller.
QC checklist before you pay
- Ask for a photo of the caseback and the movement.
- Request a side profile shot to judge thickness.
- Confirm the dial version and strap color in writing.
- Ask for a video with the chronograph running.
- Check the return policy and the shipping method.
- Pay with a method that allows a dispute.
Legal and practical notes
Replicas are counterfeits. Selling one as a genuine IWC is fraud, and importing or selling counterfeits breaks the law in the US, the EU, and most other markets. Customs officers seize replica watches on a regular basis, so a package can vanish with no refund.
A replica has no warranty, no service network, and no resale value. Buy one as a novelty if you buy at all, and never pass it off as the real thing.
FAQ
Does a fake IW371427 use a real IWC movement?
No. IWC builds calibre 79350 in house from a Valjoux base and does not sell it loose. Any movement in a replica is a third-party clone.
Can a watchmaker spot a fake IW371427?
Yes, and fast. Case thickness, dial printing, and movement finish are all visible under a loupe in under a minute.
Is the IW371427 hard to copy?
Harder than a simple three-hand watch. The bi-compax layout and the slim case force the maker to fit a chronograph movement into a tight space, which is where cheap builds fail.