A fake IW371646 is a counterfeit of the IWC Portugieser Chronograph 41, and the fastest way to spot one is to check three things together: the movement visible through the display back, the crispness of the dial printing, and the depth of the caseback engraving. No single detail proves a watch is real. Fakes fail when you compare several features at once.
What is the IW371646?
IW371646 is an IWC reference in the Portugieser Chronograph 41 family. That model uses a 41 mm steel case, two chronograph registers, and a sapphire display back that shows an automatic column-wheel movement.
The last digits of an IWC reference point to a specific case, dial, and strap combo. Confirm your exact variant on IWC's own reference list before you compare anything, because two watches from the same family can look different and still be genuine.
How can you tell if an IW371646 is fake?
Compare the movement, the dial work, and the case details. Most counterfeit IW371646 watches get one of those three right and the other two wrong.
1. The movement behind the display back
- Genuine: automatic column-wheel chronograph with striped bridges, blued screws, and a rotor engraved with the brand name.
- Fake: a stock movement or a chronograph module, rough finishing, or a printed rotor plate glued over a plain rotor.
- Instant flag: a closed steel caseback on a reference that should have a sapphire back.
A real column-wheel chronograph starts, stops, and resets with a light, snappy pusher feel. A cam-and-lever module feels stiff or mushy. That difference is hard to copy.
2. Dial printing and hands
- Text: crisp, level, and spaced. Fake dials show thick or fuzzy letters and uneven spacing.
- Subdials: deep, even concentric rings. Flat, printed-looking subdials point to a fake.
- Hands: correct length, sharp edges, and a polished finish. Look for burrs or wavy edges under a loupe.
- Date window: square cut with a clean edge. Rough or offset apertures show up on copies.
3. Case, crown, and pushers
Case lines on a genuine watch are sharp where they should be and soft where they should be, with no tool marks. Check the lug tips for sharp angles and the bezel for even width around the whole dial.
4. Caseback engraving and serial numbers
- Engraving depth: laser etching is shallow. Genuine engraving cuts into the metal.
- Reference and serial: the numbers must match the paperwork and the movement.
- Pattern: a reference number stamped on the wrong case shape is a clear warning.
5. Strap, buckle, box, and papers
Stitching on a genuine alligator strap is tight and even, and buckle engraving is deep. Papers with spelling errors or a stock photo on the warranty card are warning signs.
Why do counterfeiters copy the IW371646?
The Portugieser Chronograph is one of IWC's best-known shapes. The clean dial, the two registers, and the steel case are easy to recognize from across a room, which makes the model a target.
The display back cuts both ways. A copy can show a decorated movement, but that same window lets a buyer inspect finishing, rotor text, and gear architecture. A seller who refuses to photograph the movement is telling you something.
What are the replica grades for an IW371646?
Replica quality is sold in tiers, and the price tracks the tier. Knowing the tiers helps you judge what you are being offered.
Entry grade
Quartz or basic automatic movement, mineral glass, generic strap, printed dial. These cost the least and fool almost no one who handles watches.
Mid grade
Japanese or Chinese automatic movement, sapphire crystal, better case polishing, stamped logo. The looks improve. The movement stays wrong.
High grade or super clone
A clone or close-copy automatic movement with decorative finishing, sapphire on both sides, an engraved rotor, and a hand-polished case. This tier looks closest to a genuine watch in the hand and still fails under a loupe on fine finishing and movement architecture.
What does a fake IW371646 cost?
Prices run from under $100 for entry quartz copies to several hundred dollars for high-grade automatic versions. A genuine IW371646 sells for thousands on the secondary market, so the price gap is a signal on its own.
Anyone offering a genuine IWC at a fraction of market value is selling a fake. That rule holds in every case.
What should you check before you buy?
- Ask for photos of the movement through the display back, not stock images.
- Ask for the reference and serial, then check the combination against IWC's reference list.
- Request a short video of the chronograph start, stop, and reset.
- Confirm the return policy in writing before payment.
- Meet at a jeweler or an authorized service center when the seller claims the watch is genuine.
Is buying a fake IW371646 legal?
No. Counterfeit watches infringe a trademark, and US customs can seize shipments. Reselling a fake as genuine is fraud in most jurisdictions.
Owning a replica for personal use is treated differently from selling one. The legal risk grows with each transaction, so treat it as a real cost rather than a footnote.
Frequently asked questions
Does a fake IW371646 keep good time?
Higher-tier copy movements often hold time within a few seconds a day. Long-term reliability is the bigger gap: spare parts, servicing, and water resistance.
Will a jeweler spot a fake IW371646?
In most cases, yes, within seconds of handling it. Movement finishing, caseback engraving, and the feel of the pushers give it away.
Do fakes come with box and papers?
Yes, and that is why box and papers carry little weight on their own. Packaging copies are cheap to produce, so verify the watch, not the accessories.
Can a fake pass a water resistance test?
Some can, most cannot. Gaskets on copies are the weak point, so keep one out of the pool even if the caseback claims water resistance.