A fake IW329013 almost always fails on four points: the caseback engraving, the SafeDive bezel action, the calibre 30120 movement, and the dial print. Check those four against a genuine IWC Aquatimer and the counterfeit is clear in under a minute. Everything else, including box, papers, and strap, is secondary.

What is the IW329013?

The IW329013 belongs to the IWC Aquatimer Automatic 42 mm family: a stainless steel dive watch with a 42 mm case, sapphire crystal, and 300 m of water resistance. Inside sits the IWC calibre 30120, a Sellita SW300-1 base running at 4 Hz with roughly 42 hours of power reserve. IWC fits the line with the SafeDive bezel system, where an outer ring drives an inner dive scale so the timing scale cannot be knocked out of position.

Because the IW3290 family spans multiple dial colors and strap options, confirm the exact reference against IWC's own catalogue before you compare anything. Get that wrong and every other check is wasted.

How do you spot a fake IW329013 caseback?

Genuine engraving is cut, not stamped. Letters have crisp vertical walls and consistent depth, and the reference number sits in a straight, evenly spaced line. Fakes show shallow, rounded lettering, uneven spacing, and a reference number that does not match the dial variant.

Compare the serial number format and the fish or Probus emblem placement to a known good photo. Many counterfeiters reuse a single caseback across several fake references, which is the fastest giveaway.

Why does the bezel matter so much?

On a genuine watch, turning the outer ring moves the inner scale in step, with smooth tension and no free play. Most fakes either freeze the outer ring, leave the inner scale unattached, or add a loud ratchet click that IWC does not use here.

Turn the bezel through a full rotation on any watch you inspect. If the inner scale lags, sticks, or drifts, stop there.

What do the dial and hands reveal?

Genuine dial print is sharp at magnification, with tight, correct spacing between the IWC logo and Schaffhausen text. Fakes use heavier font weight, thicker strokes, and misaligned date windows.

Luminous compound is another tell. Genuine Super-LumiNova is applied flat inside the markers and glows evenly. Fake lume looks pitted, overfilled, or blotchy, and it often glows a different tint.

Does the movement prove authenticity?

A genuine calibre 30120 shows Geneva stripes, a signed and engraved rotor, 21 jewels, and a sweep of eight beats per second. Counterfeit movements are undecorated, run at 6 beats per second, or hide behind a solid caseback because the engraving would not survive inspection.

Ask for a clear movement photo through an open caseback, or have a watchmaker open it. A service quote from an authorized center is the final word on any questionable watch.

Quick checklist for a fake IW329013

• Caseback engraving is shallow, stamped, or reused across references.
• Inner dive scale does not track the outer bezel.
• Dial font is heavy, blurred, or unevenly spaced.
• Lume is overfilled, pitted, or the wrong color.
• Movement beats at 6 per second or lacks decoration.
• Price sits far below the current market for a genuine example.

Where do fake IW329013 listings appear?

Most show up on classifieds, social marketplaces, and auction sites under vague titles, stock photos, or claims of a missing box and papers. A seller who refuses a movement photo, avoids a service-center verification, or pressures a fast sale is describing a counterfeit, not a bargain.