Short answer

The replica IW329011 is a copy of the IWC Aquatimer Automatic 42, an internal-bezel dive watch built around a 42 mm steel case, a black dial with applied markers, and a 30120-series automatic movement rated to 300 m. A replica worth buying has to match four things: the 42 mm case diameter with a thickness near 14 mm, a smooth internal dive bezel driven by the crown at 2 o'clock, crisp dial print with correctly sized applied indices, and a movement that winds, sets, and hacks without grit. If any of those four fails, the watch fails, no matter how good the photos look.

Most cheap copies get the case size close and everything else wrong. They use a 21 mm lug width instead of 22 mm, paint the lume instead of applying it, print the date in the wrong font, and fit a bezel that clicks like a cheap sports watch instead of turning with the smooth internal action of the genuine design. The checklist below is written to catch those faults in under ten minutes with tools you already own.

Prerequisites

  • A digital caliper or a steel ruler with millimeter marks
  • A jeweler's loupe at 10x, or a phone camera with macro mode
  • Good daylight or a bright LED desk lamp
  • The seller's photo set, so you can compare what arrives against what was advertised
  • A return window you can still use after the watch lands

Inspection procedure

  1. Measure the case across the 9 to 3 line with the crown pushed in and record the number. Expect 41.8 mm to 42.2 mm, and treat anything outside that range as a wrong case.
  2. Measure the thickness at the caseback center. The genuine profile sits near 14 mm, and a copy that reads 15.5 mm or more will sit tall on the wrist and look wrong from the side.
  3. Measure the lug width with the strap off. It should be 22 mm on the nose, because a 21 mm lug is the single most common shortcut on this reference.
  4. Turn the crown at 2 o'clock and watch the internal bezel move. It should rotate with light, even pressure, hold its position, and show no wobble or metal-on-metal scraping.
  5. Check the outer bezel and the inner ring for misalignment. The triangle marker and the 12 o'clock index must line up exactly when the bezel is zeroed.
  6. Examine the dial print under the loupe. Look at the IWC wordmark, the automatic text, and the depth rating: edges should be sharp, with no blur, no double strike, and no ink pooled in the letters.
  7. Inspect each applied index for height and polish. Every marker should sit level, catch light the same way, and hold a lume fill that is flat and even instead of domed or messy.
  8. Set the date and look at the window. The font should be thin and squared, centered in the aperture, with no clipped digits and no white border showing around the disc.
  9. Check the hands at 10:10. Hour and minute hands should be the correct length, sword shaped, with clean edges and lume that fills the frame without overflow.
  10. Wind the movement 20 turns and feel for resistance. It should be smooth, and the rotor should spin freely rather than grind when the watch is tilted.
  11. Pull the crown to the setting position and check that the seconds hand hacks. A movement that keeps running while you set the time is a low-grade unit.
  12. Read the caseback engraving with the loupe. Reference, serial, and case material lines should be laser sharp and evenly spaced, not shallow or fuzzy.
  13. Fit the strap and check the buckle. The rubber should be soft, the keeper should hold, and the pin should sit straight with no side play.
  14. Run the watch for 48 hours on a wind, then compare it against a phone clock. A copy that drifts more than 15 seconds a day needs regulation or a return.
  15. Have a watchmaker pressure test it before you wear it anywhere near water, and do not trust a printed depth rating on any replica.

Instant rejection signs

  • Bezel that clicks in steps instead of turning smoothly
  • Painted or stick-on lume markers that sit flat on the dial
  • Date font that is wide, rounded, or centered off axis
  • Caseback engraving that feels raised or rough under a fingernail
  • Strap that smells of hot plastic or cracks when flexed
  • Seller photos that hide the crown side or the case profile

Work through the list in order and you will separate the small number of well-made replica IW329011 watches from the rest of the market in one sitting. Write down each measurement as you take it, because those numbers are your evidence if the seller ships something other than what was shown.