Quick answer
A fake IW323766 fails at least one of four checks: caseback engraving, crown and bezel feel, dial and date printing, and movement markings. The reference number itself is the least useful test, because clone makers copy it from press photos. What they miss is the small stuff: the separate case serial, the depth of the engraving, the font weight on the dial, and the finish on the rotor. Run all four checks before you send money.
Prerequisites
- A 10x loupe or a phone macro lens
- Bright light you can angle across the metal
- Caseback and movement photos from the seller before payment
- Any service paperwork that came with the watch
Verification steps
- Photograph the caseback at a shallow angle, then enlarge the image until the letters fill the frame.
- Compare the reference line and the serial line as two separate numbers, since IWC stamps a model reference and an individual case serial.
- Study the letter forms for sharp walls and even depth, because laser etching on clones looks grainy at the edges.
- Turn the crown through ten full rotations and note the resistance, which should feel smooth with no grit or slip.
- Rotate the bezel through a full circle and listen for a clean click at each stop instead of a soft scrape.
- Inspect the dial print under the loupe, checking the logo, the brand name, and the depth rating for crisp edges and consistent spacing.
- Look at the date window for a centered number with the correct typeface and no shadow at the edges.
- Ask the seller for movement photos, then compare the caliber number, rotor engraving, and bridge finish against the published specification for that reference.
- Weigh the watch on a kitchen scale and compare the figure to the listed weight for the reference in steel.
- Send the serial and reference to an IWC authorized service center and ask them to confirm the pair matches a produced watch.
Red flags that end the conversation
- A seller who refuses movement photos
- A serial that repeats the reference digits
- Engraving that sits on top of the metal instead of inside a recess
- A price far below the current market for the reference
- Papers with a printed reference number that does not match the caseback
If you already bought one
Stop wearing the watch and do not polish it. Take clear photos of the caseback, dial, crown, and movement, then book an inspection with an IWC authorized service center. Their written assessment is the document you need for a chargeback, a PayPal dispute, or a card claim. Most dispute windows close after 120 days, so file early and keep the packaging and any chat history with the seller.