A fake IW371766 is a counterfeit copy of the IWC Portugieser Chronograph, a 41 mm steel bicompax chronograph with a 30 minute counter at 12 o'clock and small seconds at 6. Replica builds run from about $80 for quartz to $450 and up for Swiss movement versions, and the price gap shows up in the movement, the crystal, and the dial printing far more than in the case silhouette.
What is the IW371766?
The IW371766 is a Portugieser Chronograph from IWC Schaffhausen, a line defined by a clean dial, leaf shaped hands, and applied indices. The case measures about 41 mm across and roughly 13 mm thick, with a 20 mm lug width and a sapphire caseback that shows the movement.
Inside sits an in-house automatic chronograph calibre with a 46 hour power reserve. The layout is vertical bicompax, one subdial at 12 and one at 6, with no date aperture anywhere on the face.
How do you spot a fake IW371766?
Dial geometry is the fastest check. Genuine vertical bicompax spacing puts both subdials on the same centerline, while many copies drift the 12 o'clock counter sideways or oversize both registers.
Other reliable tells:
- Subdial hand length: copies often stop short of the printed track.
- Crystal clarity: genuine sapphire carries anti reflective coating on both faces, so the dial reads black from an angle instead of milky.
- Caseback: a sapphire display back with a decorated rotor and correct engraving, not a solid steel plate.
- Thickness: builds over 14 mm rarely match the genuine profile.
- Hands: leaf shaped hands with crisp edges and mirror polished tops.
What movement does a replica IW371766 use?
Most replicas use one of three movements: a quartz module, an Asian 7750 chronograph, or a Swiss grade automatic. The 7750 family is the workhorse, and it needs a transfer gear to drive the subdial at 6, which is the most common failure point on mid tier copies.
A 7750 based chronograph starts, stops, and resets with a firmer pusher feel than quartz, and the seconds hand sweeps at 28,800 vibrations per hour. No replica carries the genuine in-house calibre, so any listing claiming an authentic IWC movement is false.
What are the replica quality tiers?
- Entry quartz, roughly $60 to $120. Correct outline, printed dial, mineral glass, chronograph function of little use.
- Mid tier Asian 7750, roughly $200 to $320. Working chronograph, sapphire on request, decent dial printing.
- High end Swiss or clone movement, roughly $400 to $700. Correct thickness, better finishing, coated sapphire, accurate subdial spacing.
What red flags should buyers check?
- Stock photos instead of the actual watch, especially blurred caseback shots.
- No movement photo, or a rotor with generic engraving.
- Prices far below tier norms for a claimed Swiss movement.
- Listings that promise box, papers, and a warranty card for a counterfeit.
Is buying a fake IW371766 legal?
No. Counterfeit watches infringe registered trademarks, and shipments can be seized and destroyed by customs in the United States and the European Union. Buyers can lose both the watch and the money paid for it.