IW329120 does not appear in IWC's published collection. A watch sold under that number should be treated as unverified until a serial check confirms it. Counterfeit sellers invent reference numbers or copy them from another model, so the number alone proves nothing.
How IWC reference numbers work
IWC writes references as IW plus six digits. The first four digits mark the family. The last two mark the variant: case metal, dial color, bracelet or strap, and market. The reference sits on the caseback, next to a serial number.
- Check the number against IWC's own product pages.
- Check the serial against IWC service records at a boutique or authorized dealer.
- Compare family, case size, and caliber in the listing with the official spec.
Caseback and engraving
Genuine IWC engraving is cut into the metal. Counterfeits use laser etching that shows a dot pattern under 10x magnification.
- Look at the letterforms. Compare them with photos from IWC or a dealer.
- Check the gap between the reference and the serial. Fonts and spacing drift on fakes.
- Check the caseback notches and the gasket seat. Poor machining leaves burrs and gaps.
- Weigh the watch. Fakes run light for the stated case size.
Dial and movement
- Indices are applied, with clean edges and even lume fill.
- "Schaffhausen" is spelled and kerned as on the original. Missing or crowded letters are common faults.
- The date window sits square to the dial aperture.
- Movement: check rotor engraving, jewel count, and finishing. Compare a caseback photo with IWC's published caliber spec.
- Crown action, bezel rotation, and pusher travel should feel tight and even.
Papers, price, and seller
A price far under the market for the same reference is the main signal. Other flags: wire transfer, crypto, or payment apps only; no return policy; photos reused across listings; a warranty card with no dealer stamp.
If the watch is already in hand
Take photos of the caseback, dial, movement, and paperwork. Keep the messages and the payment record. Ask the seller for a refund in writing, then dispute with your card issuer or platform. Report the listing to the platform, and report the counterfeit to IWC and to your customs authority.
The fast test
Take the watch to an IWC boutique or authorized dealer. Staff can match the serial against service records. That check takes minutes and settles the question.