The short answer
The tell on a fake IW329132 is rarely the dial print. It is the bezel. The genuine Aquatimer Automatic 42 uses IWC's SafeDive system, where the outer ring drives an inner rotating dive scale, and that mechanism has a distinct, damped, mechanical feel. Most replicas either decouple the two rings or turn with a gritty, hollow click. If you only check one thing, check that.
Second tell: the movement. The real watch runs IWC caliber 30120, a Sellita SW300-1 base finished and regulated by IWC. Fakes run Miyota 9015, Seagull ST2130, or a clone ETA 2824. Those are not bad movements, but they sound and behave differently, and the date change does not snap the same way.
What the IW329132 actually is
This is a 42mm steel Aquatimer, roughly 14.5mm thick, rated to 300 meters, with a sapphire crystal, screw-down crown, and IWC's tool-free bracelet or strap change system. The case has broad lugs and a mix of brushed and polished surfaces. Water resistance is the number that matters here, because a dive watch that fails at 30 meters is not a dive watch.
Where replicas fall short
Case and bracelet
Genuine brushing runs in one direction and catches light in a clean line. On fakes the brushing is often coarser, the lug edges are slightly soft, and the polished chamfers are wider than they should be. Bracelet articulation is the giveaway when you wear it: real links fold without rattle, and the end links sit flush against the case with no gap at the top.
Bezel and crystal
The inner dive scale on a genuine sits perfectly parallel to the dial and lines up on the triangle at 12. Fakes show a hair of tilt, and the printed numerals on the ring look thicker. Anti-reflective coating on the real crystal kills reflections from most angles; on a replica you get a faint blue or purple wash instead.
Dial, hands, and lume
Applied indices on the genuine are set level and the lume fills them evenly. Replicas show overflowing lume, uneven depth, and hands that look a touch flat. Charge both with a phone light in a dark room. Real Super-LumiNova burns bright white-green and fades slowly. Fake lume glows weak and dies in under an hour.
Date wheel and crown
The date font on an IWC is specific and thin. Replica date wheels tend to be bolder and sit slightly off-center in the window. The crown engraving is another cheap spot to fake: shallow, blurry IWC lettering on a crown that feels loose when you unscrew it is a bad sign.
Caseback engraving
Laser engraving on the genuine is deep enough that a fingernail catches the edges. Reference and serial numbers are crisp and correctly spaced. Fakes use a shallower etch that looks gray rather than cut, and the reference digits are frequently the wrong font.
The bait-and-switch problem
Honest warning: IW329132 replicas are far rarer than Submariner replicas, so a lot of sellers use photos of a genuine watch or of a different reference and ship something else. Ask for a timestamped video of the actual watch running, the bezel being turned, and the caseback in macro. If a seller cannot produce that, the listing is probably borrowed photos.
What I would ask before paying
- A short video with the watch on a timegrapher, showing rate and amplitude.
- A close video of the inner bezel turning through a full rotation.
- Weight on a scale, and the exact movement name and version.
- Macro of the caseback, crown, and clasp engraving.
- Confirmation of whether water resistance was actually tested, and to what pressure.
Practical bottom line
No replica of this reference will survive pool duty the way the real one does, and I would not swim in one regardless of what the listing claims. Judge the fake on feel: bezel action, bracelet fit, movement quietness, and lume. Those four things separate a $400 replica from a $150 one far more reliably than any photo of the dial.