The short answer

The replica IW329002 copies the IWC Aquatimer Automatic 42 mm in stainless steel on a steel bracelet. The genuine watch uses IWC calibre 30120, a 42 mm case, a 300 m depth rating, and the SafeDive bezel system where the outer ring drives an inner ring. A strong copy gets the width right, holds the dial layout, matches the bracelet taper, and turns the bezel with even steps. A weak copy runs thick, sets the date off center, and shows machine marks on the bezel edge. Work the checks below before you send money.

Prerequisites

  • Genuine specs on hand: 42 mm case, roughly 14 mm thick, 300 m rating, calibre 30120.
  • Digital calipers or a steel ruler.
  • A 10x loupe or macro photos from the seller.
  • A seller with a return window of at least seven days.
  • The assumption that no replica is safe for swimming.

How to check one before you buy

  1. Ask the seller for daylight photos of the dial, the caseback, the clasp, and both case flanks.
  2. Measure the case width with calipers. A correct copy reads 42 mm at the bezel edge.
  3. Measure the case thickness. Anything past 15 mm sits tall on the wrist and is a giveaway next to the real 14 mm profile.
  4. Check the lug to lug span and look at how the end links meet the case. Gaps, overhang, or a loose fit all point to a rushed build.
  5. Compare the dial print at 10x against a photo of a genuine dial. Look at the IWC logo, the word AUTOMATIC, and the depth rating line.
  6. Turn the bezel through a full rotation and count the clicks. The SafeDive ring should move in firm, even steps with the inner ring tracking the outer ring.
  7. Study the date window at 3 o'clock. The cut should be clean, the disc white, and the print centered in the aperture.
  8. Tilt the crystal under a lamp. Good anti reflective coating keeps the dial readable with little color cast.
  9. Inspect the crown and the caseback engraving under magnification. Deep, sharp lettering is the standard to hold.
  10. Ask which movement runs inside. Common options are a Miyota 9015 or a copy of the Sellita SW300-1.
  11. Check the bracelet taper and the clasp micro adjust. Links should hinge without slop and the clasp should close with a solid snap.
  12. Treat every water resistance claim as decoration. Do not swim, shower, or dive with a replica, no matter what the listing says.

Movement notes

IWC calibre 30120 is based on the Sellita SW300-1, an automatic movement with a 28,800 vph beat rate and about 42 hours of reserve. Replicas rarely carry that base. Most run a Miyota 9015, a Seagull automatic, or a decorated clone. Ask for a photo of the movement through the caseback, then check the rotor engraving and the finishing on the bridges.

Common tells on a poor copy

  • Bezel insert print that fades or smears at the edges.
  • Date wheel that sits low or high in the window.
  • Bracelet screws that sit proud of the link surface.
  • Lume that glows green when the genuine dial glows blue white.
  • Crown guards that look soft or rounded instead of crisp.

After it arrives

  1. Photograph the watch on arrival for your own record.
  2. Time it against a reference clock for 24 hours to check the rate.
  3. Wipe the case and bracelet with a soft cloth after each wear.
  4. Rinse the bracelet with fresh water and dry it if sweat or salt builds up.
  5. Store it away from magnets, phones, and speakers.