A fake IW371487 is a replica of the IWC Portuguese Chronograph, a 40.9 mm two-register chronograph from the 3714 reference family. The quickest way to spot one is the chronograph hand: on the real watch the central seconds sweeps in eight steps per second, while a quartz fake ticks once per second. The second tell is price. Genuine examples sell used in the four-figure range, and no authentic IW371487 changes hands for $250.
What Is the IW371487?
The IW371487 belongs to the IWC Portuguese Chronograph line, a series that pairs a clean two-register dial with a 40.9 mm case. IWC uses a 3714 prefix across the family, so case size, dial layout and strap options carry over between references.
- Case: 40.9 mm stainless steel (gold versions exist), about 12.3 mm thick
- Movement: caliber 79350, a Valjoux 7750 base modified by IWC
- Power reserve: about 44 hours
- Water resistance: 30 m, which covers splashes and rain
- Dial: two subdials at 12 and 6, applied numerals, printed IWC Schaffhausen logo
IWC has issued many dial colors, special editions and strap combinations across the 3714 family. Check the exact reference against IWC records or a dealer before you compare a watch to photos online.
How Do You Tell a Fake IW371487 From a Genuine One?
Work from the movement outward. Movement and chronograph behavior give the answer in seconds, and case details confirm it.
Does the chronograph behave like a mechanical watch?
Start the chronograph and watch the central hand. A real IW371487 uses a 7750 base that beats 28,800 times per hour, so the chrono seconds move in eight small jumps per second. A quartz fake jumps once per second, and a cheap mechanical fake can stutter or reset to the wrong position.
What does the movement look like through the caseback?
- Real: engraved IWC rotor, Geneva stripes, perlage, blued screws, jeweled bearings, no plastic parts
- Fake: plain rotor, matte plates, a plastic movement ring, and often a rotor that spins with a tinny rattle
- Fake: a visible movement spacer from the side, which means the case and movement were not made for each other
Solid casebacks hide all of this. If the seller refuses to show a movement photo, treat the listing as a fake until proven otherwise.
Which case details give a fake away?
- Diameter and thickness: fakes run wide (41.5 mm or more) or thick, so the watch sits high on the wrist
- Pushers and crown: real ones thread and click with a firm feel, fakes feel loose or gritty
- Caseback engraving: real text is cut deep with sharp edges, fakes look laser-etched and shallow
- Lugs: real lugs are polished on top and brushed on the side, fakes often skip the two-tone finish
What about the dial printing and hands?
Look at the subdial rings under a loupe. Real rings are thin, even and printed in one pass. Fakes show thick rings, misaligned centers and a logo that sits a hair off the 12 position.
Hands are a strong tell. IWC uses heat-blued or polished hands with crisp edges. Fakes use painted hands that show a flat blue under light, plus burrs on the edges.
Do box and papers prove a watch is real?
No. Replica sellers ship cloned boxes, booklets and cards for a small fee, so packaging proves nothing on its own. The serial number, the movement and the chronograph behavior do the work.
What Do Fake IW371487 Watches Cost?
Replica pricing follows the movement, not the brand name on the dial. Expect these bands from common sellers.
- Quartz: $40 to $90. Right look at a distance, wrong everything else.
- Entry automatic: $120 to $250. Asian 7750 copy or a generic automatic, decent case, rough finishing.
- Mid tier: $250 to $400. Better dial printing, sapphire crystal, working chronograph.
- High tier (super clone): $400 to $750. Closest case shape, decorated movement, solid strap or bracelet.
Prices move with supply and currency, so treat these as bands rather than fixed figures. Anyone selling a "1:1 Swiss made" IW371487 for $180 is selling a mid-tier watch with a better story.
Which Movement Sits Inside a Replica IW371487?
Three movement types cover almost every fake on the market.
- Quartz module: thin, light, no sweep. The chrono hand ticks. Easiest to spot.
- Asian 7750 copy: the standard choice in automatic fakes. It runs at 28,800 vph and copies the real layout.
- Seagull or other hand-wound chrono: less common. It gives the right sweep but the wrong winding feel.
Asian 7750 copies hold up when they are clean and oiled. Many arrive dry, which leads to a gritty chrono feel and a short service life.
Is a Fake IW371487 Worth Buying?
It depends on what you want from the watch.
- Want the Portuguese look on a small budget? A mid-tier automatic gets you most of the visual result.
- Want a watch you can service, insure and pass on? Buy a used genuine example instead.
- Want water resistance for swimming? Skip both. The real watch is rated 30 m, and fakes cut corners on gaskets.
Also weigh the legal side. Some countries restrict the sale of counterfeit goods, and resale value for a fake sits near zero.
How Do You Check a Seller Before You Buy?
- Ask for photos of the movement, not just the dial.
- Ask for timegrapher numbers: rate, amplitude and beat error.
- Request a short video of the chronograph start, stop and reset.
- Ask for the case diameter measured with calipers in the photo.
- Confirm a return window in writing.
A seller who answers all five is running a real business. A seller who dodges the movement question is moving quartz watches with a story attached.
Frequently Asked Questions
How much does a fake IW371487 cost?
Most range from $40 for quartz to about $750 for a high-tier automatic. The $250 to $400 band gives the best balance of looks and build.
Does a fake IW371487 have a working chronograph?
Automatic and quartz fakes both run a working chronograph in most cases. Quartz versions tick once per second, which looks wrong next to a real 7750-based watch.
Can a jeweler spot a fake IW371487?
Yes. A watchmaker with a loupe and a caseback tool needs less than a minute. Movement finish, engraving depth and chronograph behavior settle it.
Are fake IW371487 watches water resistant?
Treat every fake as splash resistant at best. Gaskets are often missing or undersized, and the caseback seal is the first part to fail.
What is the biggest giveaway of a fake IW371487?
The chronograph hand. Eight jumps per second means a mechanical 7750 base. One jump per second means quartz.