Short answer
The IW329002 is an IWC Aquatimer Automatic 42: a 42mm stainless steel dive watch, 300m water resistant, sapphire crystal with anti-reflective coating on both faces, and IWC calibre 30120 inside. If someone offers you one for the price of a dinner, it is a copy. Fakes identify themselves in four places: the caseback engraving, the movement visible through the display back, the bezel and crown feel, and the dial print under a loupe.
What the genuine reference looks like
The Aquatimer Automatic 42 sits on the slimmer side of IWC's dive line. The case is brushed on the flanks with polished bevels, the lugs are short and angled, and the strap uses IWC's quick-change system, so a bracelet or rubber strap swaps without tools. The dial is matte black with applied indices filled with lume, and the hands are broad with a lume insert on the hour and minute. Inside, calibre 30120 is a Sellita-based automatic with a 42 hour power reserve and a decorated IWC rotor, which you can see because the caseback is sapphire.
Where copies fall apart
Caseback and serial
Genuine IWC engraving is shallow, sharp, and perfectly even. Copy engraving looks laser-etched, sits too deep, and often has a soft or doubled edge. Reference and serial numbers on real watches are crisp and consistently spaced. On fakes the spacing drifts, and the serial frequently repeats across different sellers, which is the easiest tell of all if you compare listings.
Movement
Open the caseback photo and look at the rotor. Copies usually run a generic Chinese or low-grade automatic with a stamped rotor, no perlage, no Geneva stripes, and a balance wheel that looks unfinished. A real 30120 has visible finishing, blued or polished screws, and a rotor that fills the case properly instead of floating with a gap around it.
Dial, hands and lume
Print on a genuine dial is razor sharp, including the tiny text at the bottom. Fakes get the font weight wrong, the indices sit unevenly, and the lume is often a different colour from the hands or glows for a few minutes and dies. Look at the date window: on copies the aperture is cut slightly off-centre and the date sits low or high in the frame.
Bezel, crown and bracelet
The bezel on a real watch indexes firmly at 12 with no rock. On copies it wobbles, clicks softly, or over-rotates past the marker. The crown should thread smoothly and stop cleanly at both positions. Bracelet end links on fakes rarely sit flush against the lugs, and the clasp engraving is shallow.
What "first copy" means in listings
First copy, mirror quality, and 1:1 are seller terms, not factory grades. They describe how close a replica looks in photos, nothing more. No copy uses IWC's movement, and no copy carries an IWC warranty. The word tells you what you are buying, not how good it is.
Checks before you pay
- Ask for a clear photo of the caseback with the serial visible, then compare it against other listings of the same reference.
- Request a movement shot through the display back and look at the rotor finish.
- Weigh it. A real steel Aquatimer on bracelet has a heft that copies rarely match.
- Check the seller's return policy and whether they will accept a third-party authentication.
- Treat any price far below the pre-owned market as the answer to your question.
Warranty and service reality
IWC will not service or supply parts for a counterfeit, and an independent watchmaker may refuse the job once the movement is open. Water resistance on a copy is unverified, so swimming with it is a risk to the watch and to you. Selling a counterfeit watch is also illegal in the US and can be seized at import under trademark law. If you want the real thing, buy from a dealer who will put authenticity in writing.