The fastest way to spot a fake IW545120 is the caseback. Genuine IWC engraving is cut deep, even, and crisp, and the reference number matches the model, the papers, and the serial. If the lettering looks shallow, faint, or printed on top of the metal, the watch is not genuine. When anything is unclear, take the watch to an IWC service center and have the serial verified before money changes hands.
Before you start
- A 10x jeweler's loupe
- Digital calipers
- A scale that reads to 0.1 g
- The box, papers, warranty card, and any service receipts the seller claims
How to check an IW545120 step by step
- Photograph the caseback in daylight and read every character. The reference number and serial must sit on straight baselines with uniform spacing.
- Check the engraving under the loupe. Genuine cutting has sharp walls and a matte floor. Fake engraving looks sandy or rounded.
- Record the serial number and ask IWC or an authorized dealer to confirm it against the reference. This single step settles most cases.
- Inspect the dial print. The brand name, the reference line, and the minute track should be clean at 10x with no ink bleed or broken serifs.
- Compare the hands. Genuine hands are polished on the bevels, uniform in width, and set to the correct length against the track.
- Measure the case with calipers and weigh it. Counterfeit cases run thick, light, and slightly off on lug width.
- Feel the crown. Winding should be smooth with clear stops. Gritty or loose winding points to a cheap movement.
- Have a watchmaker open the caseback. Look for Geneva stripes, perlage, blued screws, and correct movement markings.
- Match the papers to the watch. Serial, reference, and case number must appear on the warranty card and match the caseback.
- Get written confirmation from an IWC service center before you pay.
Red flags that end the conversation
- A serial number that does not match the warranty card or the reference
- Caseback text that is laser-printed rather than engraved
- Dial text with uneven spacing or a wrong font weight
- A rotor or bridge with no finishing under magnification
- A seller who refuses an inspection or a service-center check
- A price far below the market for the reference and condition
Why the movement decides it
IWC finishes its movements with striped bridges, circular graining, and polished screw heads on most references. Counterfeit movements copy the layout but skip the finishing, so the surface looks flat and gray under light. Open the case only with the right tools, or hand it to a watchmaker. A scratched caseback lowers the value and can hide the evidence you need.
Papers, box, and provenance
Counterfeit sets often ship with a convincing box and a blank or mismatched card. Ask for the original purchase receipt, the servicing history, and the seller's identity. A genuine seller will hand over all of it and welcome a verification appointment. Walk away from anyone who pressures you to buy on the spot.