The IW371647 is an IWC Portugieser Chronograph. Fakes of it are common. Most sell for $250 to $900. They copy the case outline and the two-subdial layout. They fail on the movement, the dial printing and the caseback. No replica carries the IWC 69355 caliber.
What the reference is
The Portugieser Chronograph family uses a 41 mm case that measures 12.3 mm thick, with 30 m water resistance and sapphire glass on both sides. The movement is the IWC 69355, an in-house automatic with a column wheel, a vertical clutch and 46 hours of power reserve. It beats at 28,800 vph. Small seconds sit at 6 o'clock and the chronograph minutes counter sits at 12.
I could not verify the exact dial color and strap pairing that IWC shipped under IW371647. Confirm the colorway on the IWC site or on the dealer card before you trust a listing that names one.
Why Buy Fake IW371647: A Comprehensive Buying Guide
Where replicas fail
- Movement. The 69355 runs small seconds at 6. Many fakes use an A7750 base, which puts small seconds at 9. Watch which subdial moves once per second.
- Dial print. "IWC SCHAFFHAUSEN" sits above the center. The text on a fake is heavier and sits closer to the subdials.
- Caseback. The sapphire back shows a decorated rotor and striped bridges. Fakes use a flat etch with soft edges.
- Pushers. Genuine pushers start and stop with a firm click and short travel. Replica pushers feel spongy.
- Serial. The case number sits between the lugs at 6 o'clock. Fakes repeat a small set of numbers across batches.
Checks you can run
- Measure thickness with a caliper. IWC lists 12.3 mm. Most fakes run 13 mm to 14 mm.
- Ask for a macro photo of the dial print and of the subdial rings.
- Send the case number to IWC service. The brand confirms case numbers on request.
- Compare the price. A steel Portugieser Chronograph trades at about $5,500 to $8,000 on the secondary market. A $600 offer is not a bargain.
What a replica cannot do
Service is the main limit. IWC will not service a counterfeit. Independent watchmakers refuse them in many cases because parts do not exist. Water resistance on a fake is a guess. The 30 m rating on the genuine watch comes from tested gaskets and a tested case.
Resale is the second limit. A fake has no resale channel. Dealers and auction houses reject them, and marketplaces pull the listings when a buyer files a claim.