A replica IW329173 is a copy of IWC's Aquatimer Automatic 42, the dive watch that runs on the brand's SafeDive rotating bezel system. The good ones are automatic, 42mm, and built around a proven third-party movement. The bad ones look fine in a thumbnail and fall apart the second you turn the bezel. That one detail is what separates a $120 watch from a $450 watch, more than the dial printing or the box it ships in.
Start with the bezel, not the dial
SafeDive is a mechanical linkage. The outer bezel turns, and an inner ring carrying the dive scale moves in step with it. Faking that costs money, so most factories don't bother. Cheap copies print the inner scale on a fixed ring and let the outer bezel spin free. Others glue the two together so the inner ring never moves at all.
Ask for a video with the bezel rotated through a full turn. Watch the inner scale track the outer one. Listen for detents that click. Grinding, wobble, or a quarter-turn of slop means you're looking at a bottom-tier case.
Movement: nobody is shipping an in-house caliber
IWC fits its own automatic caliber to this line. No replica runs that, and any seller who says otherwise is lying. What you actually get is usually a Miyota 9015, a Seagull ST21, or an Asian clone of an ETA 2824. None of those is bad. The Miyota is thin, parts are everywhere, and a local watchmaker can regulate it for $40.
What you should avoid is an unmarked movement with no identifying stamp. Those are the ones that die in eight months or run 40 seconds fast a day with no fix.
Case, dial, and the small stuff
- Indices should be applied and sit level. Printed indices on a watch at this price point are a tell.
- Check the date window in photos. Off-center dates are the single most common flaw on mid-tier copies.
- Look at the crystal at an angle. A milky halo means coated mineral glass, not sapphire with anti-reflective treatment.
- Crown threads should feel smooth going in. Cross-threading on a diver is a dead watch waiting to happen.
- On the bracelet, end links should sit flush against the case with no gaps you can see daylight through.
What the tiers actually cost
Under $150 you get quartz or a low-grade automatic, a printed dial, and a bezel that does nothing. Between $200 and $350 you find decent automatics, sapphire, and a working bezel linkage on the better examples. Above $400 you're in the top of what exists for this reference, with proper lume, real AR coating, and solid end links.
IWC replicas sit lower on the price ladder than Rolex clones. Demand is thinner and the factories make fewer of them, so don't let anyone quote you super-clone Rolex money for one of these.
Before money changes hands
Get QC photos of the exact watch, not catalog shots. Ask for a timestamp. Ask for a movement photo. If a seller refuses returns or only communicates through disappearing messages, walk. Pay with something reversible.
One more thing worth saying out loud: selling counterfeit watches is illegal in the US, and Customs does seize parcels. That risk is real. If it matters to you, buy a Seiko diver and skip the whole exercise.
Living with it
Don't dive with it. Gaskets are the weak point on every replica, and the depth rating on the caseback is decoration. Rinse it after saltwater, keep it away from hot showers, and expect a service or a movement swap within a few years. Treated as a $400 watch rather than a $6,000 one, a good IW329173 copy holds up fine.