Answer first
A fake IW323729 is a counterfeit of the IWC Ingenieur Automatic. The two checks that settle most cases are the movement and the case back. A genuine example runs an IWC-signed automatic caliber with a decorated rotor, and its reference and serial numbers are cut deep and crisp into the case back. Most fakes run a stock ETA or Asian clone, print or shallow-etch the case back, and fit the bracelet with a visible gap at the lugs.
Prerequisites
- A 10x loupe and a bright, diffused light
- Digital calipers for case and bracelet measurements
- Macro photos of a genuine IW323729 for side-by-side comparison
- The published IWC spec sheet for the reference: case size, caliber, water resistance
- Access to a watchmaker for a movement inspection
Step-by-step inspection
- Confirm the reference exists in IWC's catalog and pull the official specs. A seller who cannot name the caliber or case diameter is a red flag before you touch the watch.
- Measure the case with calipers and compare it to the published figure. Fakes are commonly 0.5 to 1 mm off, and the error shows at the lug tips.
- Examine the case back engraving under the loupe. Genuine text has vertical walls and sharp interior corners. Replica engraving looks rounded, shallow, or lasered with a dark fill.
- Read the serial and reference numbers for consistency. The font, spacing, and depth should match known genuine examples of the same production period.
- Check the dial print. Look for flat, fuzzy, or doubled text in the logo and the minute track, plus date wheels that sit off-center in the window.
- Inspect the hands and markers at an angle. Genuine hands are polished on the bevels with clean edges. Fakes show burrs, uneven lume fill, and gaps between marker and dial.
- Test the bracelet fit. An integrated-style bracelet should meet the case with a tight, even line on both sides. Rock the end link; movement or a light gap points to a replica.
- Check the crystal and anti-reflective coating. Genuine coating gives a faint blue or colorless tint with no mirror effect at oblique angles.
- Have a watchmaker open the case. Confirm the caliber number, the rotor engraving, and the finish on bridges. Photograph the movement before you buy.
Fast red flags
- Price far below the going rate for the reference, with pressure to buy quickly
- Stock photos instead of images of the actual watch
- No service history paperwork and no box or papers, offered as a excuse for the price
- A seller who refuses an inspection or a movement photo
- Case back text with wrong capitalization, wrong spacing, or a missing reference
- Bracelet screws that are slotted instead of the correct profile
What replicas get wrong
Replica makers copy the silhouette well and the details poorly. The bracelet end links, the crown profile, and the movement finishing are where the money shows. Even high-grade replicas use a clone movement with a decorative plate, which a watchmaker identifies in minutes. Buy the seller as much as the watch: a documented service history and a willingness to allow inspection matter more than a sharp photo.