Short answer
A fake IW371489 is a watch that copies the IWC Portugieser Chronograph reference IW371489 but was not built by IWC. The reference sits in the 3714 block. That block uses a stainless steel case, a date at 3 o'clock, small seconds at 6 o'clock and a chronograph minute counter at 12 o'clock. Copies come in three grades: quartz lookalikes, mid-grade builds with a Chinese chronograph movement, and high-grade builds around a Valjoux 7750 base. None use IWC cases, dials, hands or finishing.
Reference number basics
IWC writes its references as IW plus six digits. IW371489 belongs to the same family as IW371401, IW371417 and IW371446. Published spec sheets for the 3714 block list a steel case about 40.9 mm across and 12.3 mm thick, sapphire crystal, 30 m water resistance, 20 mm lug width, leather strap, date at 3 o'clock, and calibre 79350. Calibre 79350 is an IWC-modified Valjoux 7750: 28,800 vibrations per hour, about 44 hours of power reserve. Use those numbers as a checklist. Confirm the exact IW371489 record with IWC before you pay for one.
Where copies fail
Caseback
Genuine casebacks carry the reference, a case number, "International Watch Co.", "Schaffhausen", the water resistance rating and the case material. The digits are engraved, not stamped, and the case number changes from watch to watch. Fake casebacks repeat one serial across a whole run, and the font is wider than the original.
Dial and hands
Check the date window at 3 o'clock. On copies it sits too far from the flange, the aperture is square instead of rectangular, and the date font is thin. Subdial rings on copies print as flat circles. On the original they are recessed and snailed. Copy hands show polished edges under a loupe where the original has brushed tops with polished bevels.
Movement
Ask for a movement photo and a timing reading. Calibre 79350 beats at 28,800 vph. A quartz copy has a jumping seconds hand at 6 o'clock. A 21,600 vph clone sweeps at the wrong rate. Rotor engraving on copies uses a heavy serif font and the wrong jewel count.
Case, crown and pushers
Pushers on copies travel with a rattle and return with a click. Original pushers have short, damped travel. The crown on a copy sits proud of the case band. On the original it sits close.
Price benchmarks
A steel Portugieser Chronograph sold new for roughly 7,000 to 8,000 USD before tax in the late 2010s. Pre-owned 3714 examples trade between about 3,800 and 6,000 USD with box and papers. High-grade copies sell for 400 to 900 USD. A complete set offered under 2,000 USD is a fake or a scam listing. Prices move, so compare sold listings, not asking prices.
Papers, box and service history
- Warranty card with a reference and case number that match the caseback.
- IWC service invoice with the movement number.
- Box with the insert used in the year of production.
- Dealer receipt or an auction lot record.
Documents get copied as well. A card proves nothing on its own. Match the numbers, then verify the numbers with IWC or an independent watchmaker.
Photo checks that do not settle it
A dial photo cannot show beat rate, case finishing or engraving depth. Listings that hide the caseback, the movement or the serial are the ones to skip. Ask for a photo of the caseback edge and a short video with the chronograph running.
Questions to ask a seller
- What is the case number on the caseback?
- Does the reference on the card match the caseback?
- Has the watch been serviced, and by whom?
- Can you send a photo of the movement with the rotor visible?
- What is the return window?