Short answer
A fake IW323746 is a counterfeit of the IWC Ingenieur Automatic, a 40 mm stainless steel watch with an integrated bracelet. Counterfeits of this reference show up in two forms: cheap builds sold as genuine watches, and higher-grade replicas sold openly as replicas. Four checks settle the question. Case size and finish, dial printing, caseback engraving, and the movement under the caseback. If any one of those four is wrong, the watch is not genuine, no matter how good the listing photos look.
What IW323746 actually is
IW323746 belongs to the Ingenieur Automatic line, which IWC built around anti-magnetic protection. The watch has a 40 mm case, an integrated bracelet with H-style links, a screw-down crown, a date window at 3 o'clock, and an automatic caliber 30110 based on the ETA 2892-A2 with an IWC-signed rotor. These baseline facts matter because counterfeiters copy the visible outside of a watch far more convincingly than the inside. Learn the outside, then confirm the inside.
Prerequisites
- Calipers or a steel rule for case measurements
- A 10x jeweler's loupe
- Two or three high-resolution photos of a genuine IW323746 dial and caseback
- A kitchen scale accurate to 1 gram
- Papers, box, or service records if the seller claims they exist
How to check an IW323746 for authenticity
- Measure the case across the bezel and from lug tip to lug tip with calipers, then compare the numbers against the published IW323746 specification. Counterfeits commonly run 1 mm to 2 mm off, and the difference shows in the bracelet fit.
- Weigh the watch on a scale. A genuine stainless steel case and integrated bracelet carries real heft. Fake cases made from brass or thin plated alloy come in light, and the bracelet rattles when shaken.
- Examine the dial under the loupe. Check the applied IWC logo, the marker edges, the printed "Automatic" text, and the "SWISS MADE" signature at 6 o'clock. Genuine printing has sharp edges and even ink weight. Fakes show fuzzy borders and uneven letter spacing.
- Inspect the date window and the date font. On a genuine IW323746 the aperture edges are cleanly cut and the numerals sit centered. Fakes often show a rough-cut aperture and a date wheel whose font does not match IWC's.
- Check the hands and the lume. Genuine hands are polished on the bevels and flat on top, with lume applied level inside the frame. Fakes show wavy lume, blunt hand tips, and lume that spills over the edges.
- Read the caseback engraving. Genuine engraving is shallow, crisp, and consistent in depth, including the reference number, the serial number, and the model script. Fake engraving is often deeper, rounded at the edges, or laser-etched with a gray burn instead of a cut.
- Test the crown. It should thread smoothly, seat flush against the case, and carry a sharp IWC marking. Stiff threads, a crown that sits proud of the case, or a plain crown are warning signs.
- Study the bracelet and clasp. Look at the brushing direction, the gap between end links and case, the clasp engraving, and the micro-adjust holes. Genuine links pivot without slop. Replica bracelets usually show uneven gaps and softer polishing.
- Open the caseback only if you have the tools and the practice. Look for caliber 30110 with an IWC-signed rotor and clean finishing on the bridges. Chinese copies use clone ETA or generic movements with different balance bridges, crude rotor engraving, and mismatched jewel counts.
- Verify the serial number with IWC or an authorized service center before you pay. A serial that returns no record, or a reference number that does not match the dial and case, ends the transaction.
Where high-grade replicas still fail
Better replica builds get the dial close. They still fail on the caseback, the movement, and the bracelet. Look for engraving depth, rotor finishing, the sound of the rotor when the watch is tilted, and the fit of the end links. Ask the seller for a movement photo before purchase. Refusal to supply one is an answer by itself.
Quick red flags
- Price far below the current market range for a complete IW323746
- Seller cannot provide a movement photo or serial
- Case dimensions outside the official specification
- Fuzzy dial printing or uneven marker alignment
- Caseback engraving that looks burned rather than cut
- Bracelet with loose links and uneven brushing
Bottom line
Separate the outside from the inside. Dimensions, dial, and caseback catch most fakes in a few minutes. The movement and the serial verify the rest. On a reference like IW323746, the caseback and the caliber are where counterfeits give themselves away.