Quick answer
No single detail proves an IWC Ingenieur ref. IW323705 is genuine. Copies of IWC are less common than Rolex fakes, so most watches sold as an IW323705 fail on basic checks: caseback engraving, dial printing, crown action, and movement finishing. Confirm the reference and serial through IWC or an authorized service center, then inspect the watch under magnification. If a seller refuses either step, stop the deal.
Before you start
- A 10x jeweler's loupe or a macro lens
- Bright light you can angle across the surface
- The seller's invoice, box, and papers, if any exist
- A local watchmaker or IWC service center able to open the caseback
Step-by-step checks
- Write down the reference number and the full serial from the caseback before you handle the watch further.
- Photograph the caseback through the loupe and compare the engraving to photos of a documented IW323705.
- Confirm the reference reads IW323705 exactly, with no missing or swapped digit.
- Ask the seller for service records or IWC paperwork that lists both numbers.
- Study the dial text under magnification; the IWC and Schaffhausen lines should have clean edges and even spacing.
- Check the date window; the frame should be crisp and the numerals centered.
- View the hands and applied indices from the side; genuine parts are polished on every visible face.
- Wind the crown slowly and note the feel; grit or slack points to a cheap movement.
- Inspect the crown for a clean, centered logo stamp.
- Examine bracelet and clasp screws for burrs, off-center slots, and mismatched polishing.
- Have a watchmaker open the caseback and photograph the movement.
- Compare rotor engraving, jewel count, and surface finishing to reference images of the correct calibre.
- Verify the caseback gasket is present and undamaged before the watch is closed.
- Send the reference and serial to IWC or an authorized service center for a records check.
- Get the result in writing before any money changes hands.
Where replicas give themselves away
Caseback text on fakes is often laser-etched shallow and slightly soft at the edges, while IWC engraves deep and sharp. Dial printing is the second tell: the IWC lettering on copies tends to run thick, and the Schaffhausen line sits too close to the outer track. The largest giveaway is the movement. The calibre fitted to this reference has a specific rotor and bridge layout, and counterfeiters usually drop in a generic ETA-style or Chinese movement with a decorated rotor plate. If the rotor carries only a printed logo and no proper finishing, treat the watch as fake. Serial numbers are also cloned from real watches, so a serial that matches a stolen or sold listing means nothing on its own.
If the watch turns out to be fake
Stop the payment if you still can, keep every message and photo, and report the listing to the platform. Selling counterfeit watches is illegal in the United States, and imported copies can be seized at the border. A written statement from an IWC service center is the strongest evidence you can hand to a card issuer, a payment platform, or a police report.