Answer first
A fake IW323794 exposes itself in the metal before you ever open the case. Case thickness, bracelet link tolerance, and the depth of the caseback engraving separate a genuine IWC from a copy in under two minutes. Movement inspection confirms what the outside already told you.
Prerequisites
- 10x jeweler's loupe or a macro lens for a phone
- Digital calipers accurate to 0.01 mm
- Scale accurate to 0.1 g
- Bright raking light and a matte work surface
- Timegrapher, or a phone timing app if none is available
- IWC's own product record for the reference, plus any box and papers the seller holds
Steps
- Confirm the reference number appears in IWC's product archive with the exact case material, dial color, and bracelet you are inspecting. Copies often carry a legitimate number on a combination that never shipped.
- Measure the case diameter and thickness with calipers at the 3 and 9 o'clock line. Compare both figures against the published specification for that reference.
- Weigh the bare case head on a 0.1 g scale. A plated brass or thin steel case lands well under the weight of the genuine article in the same size.
- Inspect the dial text with the loupe. Genuine printing has crisp, uniform strokes and a flat matte or lacquer finish. Copies show fuzzy edges and ink that sits proud of the surface.
- Check the alignment of the applied markers against the printed minute track and against each other. A marker that leans or sits off center rules the watch out.
- Study the hands under raking light for bevel polish, edge burrs, and lume fill. Genuine lume sits level inside the frame with no overflow onto the metal.
- Examine the crown engraving and thread feel. The logo should be cut with a sharp edge, and the threads should engage with light, even resistance.
- Look at the caseback engraving with the loupe at an angle. Genuine IWC engraving has a defined floor and clean shoulder. Laser etching on copies looks shallow and washed out.
- Test the bracelet links for side play and the clasp for closing feel. Genuine links move with a firm, damped action and show no rattle.
- Compare the case flank brushing and the lug bevels with reference photos from a trusted source. Copy houses polish where the original is brushed, or the reverse.
- Have a watchmaker remove the caseback in a dust-controlled area rather than opening it yourself with a case knife.
- Inspect the movement finishing, rotor engraving, jewel settings, and shock protection. Look for a consistent engraving font, correct jewel count, and perlage that runs to the edges of the plates.
- Compare the movement serial number with the case serial number and with any documentation. A mismatch is the single strongest sign of a counterfeit.
- Run the watch on a timegrapher in dial-up and dial-down positions. Note the rate, amplitude, and beat error before you judge the movement.
- Verify the box, warranty card, and booklet against the reference and serial number. Check the print quality of the card and the font on the caseback sticker.
- Book an authentication check with an IWC service center before funds change hands on any watch above your comfort threshold.
Common tells on IW323794 copies
- Case thickness off by 0.5 mm or more from the published figure
- Sapphire crystal without the correct anti-reflective coating on both faces
- Rotor engraving with wrong letter spacing or a soft edge
- Clasp logo stamped instead of cut
- Date wheel font that differs from the reference image
- Serial number repeated across multiple listings online
What copies get wrong inside
Decorated generic movements are the norm in this price bracket. The engraving on the rotor is added after the fact, and the base caliber does not match the architecture of the genuine movement. Jewel count and beat rate are the fastest ways to catch this. A watch that ticks at the wrong frequency for the reference is not the watch it claims to be.
When to walk away
Walk away when the seller refuses an inspection, when the serial number does not appear on the paperwork, or when the price sits far below the market for a complete set. A genuine watch survives every step on this list. A copy fails at least one.