A watch sold as an IW328023 is counterfeit when the reference number does not match a model IWC actually made, or when the case, dial, caliber, or paperwork departs from factory specification. IWC reference numbers follow a fixed pattern, and every genuine watch is documented in the brand's own catalog. If the number on the caseback cannot be tied to a real IWC product page, stop the transaction there. No seller story overrides that check.
Confirm the reference number exists
- Read the full reference from the caseback, including every digit after the IW prefix.
- Search the manufacturer's own catalog for that exact number.
- Compare the catalog image against the watch in hand: case diameter, lug width, dial color, hand shape, strap type.
- Treat any mismatch, or a blank result, as a failed check. Counterfeiters often invent plausible numbers that sit close to real ones.
Inspect the case and dial
Finishing is where most fakes fall apart. Genuine IWC cases show crisp transitions between brushed and polished surfaces, with no rounding at the lugs or bezel edge. Look at the dial printing under magnification. Genuine text is sharp, evenly spaced, and level. Replica printing tends to smear, sit slightly crooked, or use a heavier font weight than the original. Check the date window: the numeral should be centered and flush with the dial, not sunken or off-axis. Examine the hands for uneven lume fill and burrs along the edges. On the crown, the engraving should be deep and clean rather than faint and shallow.
Check the movement
- Determine whether the model should have a solid or exhibition caseback.
- If the caseback is transparent, look at the rotor engraving and the finish of the bridges.
- Set the watch to a known time, let it run a full day, and check the rate against an accurate clock.
- Compare the observed power reserve with the figure the manufacturer publishes for that caliber.
Fakes commonly use generic movements with decorative plates, which show rough engraving, uneven perlage, and blued screws that are painted rather than heat-treated. A power reserve far below the published figure is a strong indication the movement is not the original caliber.
Caseback, serial, and paperwork
Every genuine watch has a caseback serial that differs from the reference number, plus matching documentation. Compare the serial on the case to the serial on the warranty card and the certificate. Numbers that repeat across two supposedly different watches, or that appear freshly laser-etched, indicate a counterfeit. Packaging is easy to copy, so treat boxes and papers as supporting evidence, never as proof.
Price and seller checks
A price far below the current market for that reference is the oldest warning sign. Ask the seller for the full serial, the service history, and original purchase receipts. A refusal to provide the caseback serial in writing, or a request to pay outside a protected channel, should end the deal.
If you already bought one
- Stop wearing the watch and keep it in the condition it arrived in.
- Photograph the caseback, dial, movement, and all paperwork.
- Contact the seller in writing and request a full refund.
- If payment went through a card or a protected platform, open a dispute within the stated window.
- Report the listing to the platform and to the brand's anti-counterfeiting contact.