Quick answer
A fake IW329042 V9 is a replica of the IWC Aquatimer Automatic 42 sold as the ninth build in a maker's run. The V9 label describes a batch, not a standard. It tells you the seller kept a mold or a parts list around long enough to revise it. It does not promise the watch matches IWC's own spec sheet, and two V9s from two sellers can differ in movement, crystal coating, and lume. Judge the watch in front of you.
What the genuine IW329042 is
This sits in the Aquatimer Automatic 42 family, IWC's steel dive line. The real thing carries a 42 mm case at roughly 14.5 mm thick, an internal rotating dive bezel driven by the outer ring, and a 300 m water resistance rating. The point of the internal bezel design is that the outer ring can be knocked and the timing scale inside stays put, which is the idea behind IWC's SafeDive clutch. Inside is calibre 30120, an automatic built on a Sellita SW300-1 base, with a date at 3 o'clock. Crystal is sapphire with coating on both faces, and the crown screws down.
Fake IW329042 V8: What the Version Label Means and How to Judge It
What V9 means in practice
Replica sellers reuse version tags the way phone makers reuse model numbers. V9, V9F, and similar suffixes get recycled across references entirely unrelated to each other. Some listings add an F to imply a factory name. There is no registry, no certification, and no way to verify the number against anything. Treat it as a hint about how long a particular parts set has been in circulation, nothing more.
Where these replicas usually fall short
Case and bezel
The 42 mm case is the hard part. Replicas often run a half millimeter wide or add thickness at the mid-case, and that shows up on the wrist and in the lug profile. The SafeDive action is the bigger tell. On a good copy the outer ring turns with light, even resistance and the inner scale moves one to one. On a weak one the ring feels gritty, the inner scale lags, or friction lets it drift after you set it.
Dial and lume
Print quality is where cheap builds give themselves away. Look at the index edges under a loupe. Applied markers should sit flat and level. Lume should charge under a phone light and fade evenly rather than glowing for two minutes and dying. Hands should line up with the markers, and the date should sit square in its window.
Caseback and engraving
Laser engraving on the caseback tends to be shallow and soft on replicas. Genuine markings cut deeper with cleaner edges. Serial and reference stamping should match between the caseback and any paperwork the seller shows you.
Movements you will actually find inside
Most of these run a Miyota 9015, a clone of the ETA 2892, or a decorated Asian automatic dressed up to look like a 30120. A true clone of the 30120 means the same architecture as the SW300 family, which means similar jewel count, beat rate, and winding feel. Ask which base movement is inside and whether the rotor decoration is cosmetic. If the seller cannot say, assume it is the cheapest option in the case.
Checklist before you pay
- Ask for movement photos with the caseback off, not stock images.
- Request a video of the bezel turning, not a still.
- Confirm case diameter and thickness with calipers in a photo.
- Ask how the watch was water tested, and expect an honest answer of "not tested."
- Check the return window in writing before sending money.
Water resistance, honestly
Do not dive with a replica. Seals, gaskets, and caseback torque on these builds are not held to the same standard as the real 300 m rating, and ISO 6425 testing is not something you can assume happened. A splash is one thing. Ten meters down is another, and you will find out the hard way.
Bottom line
The reference matters more than the version tag. Learn the 42 mm proportions, the SafeDive feel, and the calibre 30120 layout, then compare the specific watch you are being offered against those three things. A V9 that gets the case profile right beats a newer tag on a fat case every time.