A fake IW329062 gives itself away at the case back, the caliber stamp, and the crystal. Genuine IWC examples carry deep laser engraving with sharp edges, a movement whose rotor and bridge markings match the caliber listed for that reference, and an anti-reflective coating on both faces of the sapphire. Copies miss at least one of those three. Check them in the order below and you will separate a real IWC from a counterfeit before money changes hands.

Before you start

  • 10x loupe or a phone macro lens
  • Digital scale accurate to 0.1 g
  • Bright, diffuse light, no hard shadows
  • An archive photo of the same reference from IWC or a dealer listing
  • A watchmaker who can open a screw-down case back

Case back and serial

  1. Set the watch face down on a soft cloth under bright light.
  2. Read the reference, case number, and serial with a 10x loupe.
  3. Compare the font weight and spacing against an archive photo of the same reference.
  4. Photograph the engraving at macro distance and view it at full size on a screen.
  5. Request a serial verification from IWC customer service before you commit to a purchase.

Genuine engraving has crisp walls and a uniform depth. Counterfeit engraving looks frosted, shallow, or wider at the edges where a cutter dragged. Serial ranges on fakes often repeat across listings, so search the number you see and note whether it appears on more than one watch.

Movement and caliber markings

  1. Take the watch to a watchmaker and have the case back opened.
  2. Locate the caliber number stamped on the bridge or rotor.
  3. Confirm that number against the caliber IWC lists for the reference.
  4. Inspect the rotor for Geneva stripes, perlage, and blued or polished screws.
  5. Check the balance for a smooth, even beat with no stutter at full wind.

Clone movements copy the layout but not the finish. Stripes stop short of the edges, perlage sits uneven, and screw slots are cut off center. A rotor that spins with a rough rasp or a winding feel that grinds points to a cheap automatic rather than an IWC-built caliber.

Dial, hands, and crystal

  1. Angle the watch toward a light and look for a blue or purple sheen on the sapphire.
  2. Inspect the dial printing at 10x for raised ink, bleeding edges, or uneven spacing.
  3. Check that the hour and minute hands reach the correct point on the indices.
  4. Run the date over midnight and watch how the disc settles.
  5. Turn the crown through a full wind and feel for grit or a loose stem.

IWC applies anti-reflective coating to both faces of the crystal, so reflections stay faint and neutral. Fakes usually coat one side or none, and the glass throws a strong white flare in photos.

Weight, bracelet, and finish

  1. Weigh the watch head and compare it to the published figure for the reference.
  2. Flex the bracelet and listen for rattle between the links.
  3. Run a fingernail along the case flank to feel for sharp or wavy polishing.
  4. Check that the clasp engraving matches the case back lettering style.

A counterfeit runs light, often 20 to 40 g under spec on steel models, and the bracelet end links fit with visible gaps.

Paperwork and provenance

  1. Read the warranty card and confirm the reference and serial match the case.
  2. Compare the card print against a known IWC card from the same year.
  3. Ask for the original purchase receipt and the dealer name.
  4. Walk away if the seller will not allow an inspection by a watchmaker.

Papers are the easiest part of a counterfeit package to fake and the easiest part to verify. A serial that does not return a match from IWC, or a card with soft print and a wrong reference format, settles the question on its own.