Short answer
A watch advertised as IWC IW329030 is not genuine when the reference number is absent from IWC's own catalog, when the caseback engraving is shallow or off-center, when the movement runs at 21,600 vph instead of 28,800 vph, or when a full set is offered below $2,000. Each test stands alone. Passing one does not clear the others. "First copy" is a seller grade, not an IWC product term, and no replica leaves the IWC factory.
Step 1: Check that the reference exists
IWC reference numbers use the form IW plus six digits. The first digits mark the family. The last two mark dial and strap variants. Write down IW329030 and search IWC's model archive. Compare the case diameter, thickness, calibre number, and power reserve for that exact reference. If a seller cannot name the calibre inside the watch, stop there.
Step 2: Case, crown, and crystal
- Measure the case with calipers. A 0.5 mm gap from the published figure is normal wear on a used tool. A 1.5 mm gap is a different case.
- Check the crown. A screw-down crown on an IWC dive or pilot model should thread in 3 to 4 turns with no grit.
- Inspect the crystal. IWC fits sapphire with anti-reflective coating on both faces on many models. A purple or blue sheen under a lamp is a coating tell on cheap replicas.
Step 3: Dial, hands, and printing
Look at the printing under 10x magnification. Genuine IWC dial text has sharp edges and even spacing. Replica dials show ink bleed, uneven serifs, and letter shapes that drift between the 12 and the 6 positions. Luminous material on a real dial sits inside the applied markers. On many replicas it overflows onto the dial plate.
Step 4: Movement
Put the watch on a timegrapher. Most modern IWC automatics beat at 28,800 vph (4 Hz). A reading of 21,600 vph (3 Hz) points to an Asian clone movement such as a 2824 or 8215 substitute. Amplitude under 250 degrees or a beat error over 0.5 ms also points to a swap. Open the caseback with a watchmaker. Check rotor engraving, screw heads, and bridge finishing.
Step 5: Caseback, serial, and papers
IWC engraves the reference and serial on the caseback. The same serial appears on the movement on most models. The number on the warranty card must match the caseback and the hang tag. Replica sets often mix numbers across the three. Paper stock, print alignment, and booklet staples are all tells. Papers do not prove a watch is real. They prove that a set exists.
Price and weight signals
New steel IWC models in this class retail from about $5,000 to $12,000. High-grade replicas sell from $200 to $600. A sealed IW329030 with box and papers at $900 is a replica. A steel 42 mm watch on a steel bracelet should weigh close to the published figure. A 30 g gap between two same-size steel watches is a signal.
What this guide cannot confirm
IWC changes dials, straps, and calibres inside a reference over a production run. Without the watch in hand and the caseback opened, no check confirms a specific IW329030. Use an IWC service center for a written assessment if the value of the deal depends on it.