Short answer
A fake IW329067 gives itself away in four places: the case back engraving, the dial printing, the movement finishing, and the serial number. Genuine IWC engraving is cut deep into the metal with sharp edges. Counterfeits are laser-etched or stamped, so the letters look shallow and soft. If the engraving is weak, stop there. The rest of the watch will not save it.
What the reference number means
IW329067 is a full IWC reference. The first digits place the watch in a model family, and the trailing digits identify the exact variant, including dial color, case metal, and strap. A seller who cannot state which variant the number points to is guessing. Counterfeit sellers often mix a real reference number with the wrong dial color or the wrong bracelet, so cross-check the number against the dial and case before you look at anything else.
Prerequisites
- A 10x jeweler loupe
- Digital calipers and a small gram scale
- A case back opener, or access to a watchmaker
- Official product images of IW329067 for side-by-side comparison
Step-by-step authentication
- Read the reference number in full. It must appear exactly as IW329067, with no missing zero and no extra digits.
- Place the case back under the loupe. Genuine engraving has crisp walls and a satin floor. Fakes show rounded edges, burrs, and inconsistent depth.
- Find the serial number. It sits apart from the reference number. Genuine serials are unique. Counterfeits reuse the same handful of serials across thousands of units.
- Compare the dial printing to official images. Genuine text is applied with clean, even strokes. Fakes bleed at the edges and space letters wrong.
- Check the date window. The number should sit centered in the aperture with a matching font.
- Examine the hands. Genuine hands are polished on every facet, and the lume fill sits level with the metal frame.
- Wind the crown. Genuine threads engage in one smooth turn. Fakes feel gritty or bind after half a turn.
- Rotate the bezel if the reference has one. Each click should be firm and evenly spaced.
- Measure the case with calipers. Replicas run 0.3 mm to 0.8 mm off spec in most cases.
- Weigh the watch head. Counterfeits run light because the case is a lower-grade steel or a plated alloy.
- Tilt the crystal under a lamp. Genuine IWC uses anti-reflective coating on both faces, so reflections stay faint and colorless. One-sided or missing coating shows a blue or purple sheen.
- Have a watchmaker open the case. Inspect the rotor engraving, jewel count, and bridge finishing. Genuine Geneva stripes are sharp and consistent.
- Inspect the bracelet or strap hardware. Check screw heads, end link fit, and the clasp stamp.
- Match the serial on the case back to the warranty card, the box label, and any service paperwork. Numbers that do not line up end the deal.
Where replicas fall short
- Case back engraving depth and font weight
- Dial text sharpness and spacing
- Movement finishing under the rotor
- Crystal anti-reflective coating on both faces
- Case weight and exact dimensions
When to walk away
- The seller refuses to let a watchmaker open the case
- The serial number does not match the paperwork
- The price sits far below the current market range for the reference
- The seller ships from a stock photo and cannot provide a live timestamped image
If you are buying a replica on purpose
Buyers who search for a fake IW329067 often want a replica, not a genuine watch. Judge a replica on the same list above. A good replica still misses the case back engraving and the movement finishing, so do not pay genuine-adjacent money for one. Ask the seller for close-up photos of the case back and the movement, and confirm the return policy before you send payment.