Quick answer

IW329045 is an IWC reference number. The first four digits, 3290, sit in IWC's reference block for the Aquatimer Automatic 42 mm line. A fake IW329045 is a watch sold under that reference that IWC did not build. No set of photos proves a watch is genuine. A serial check with IWC service plus an inspection of the movement is the only reliable test.

Searches for this reference split into two groups. One group has been offered a watch and wants to know if it is real. The other group wants a replica. The checks below apply to the first group.

What the number tells you

IWC reference numbers use IW plus four digits for the family and two digits for the variant. Case metal, dial color, and bracelet change the final two digits. Two watches that share the first four digits can differ in price by more than 1,000 USD.

Confirm the exact variant on IWC's site or at an authorized dealer before you compare photos. A dial from one variant will not match another. If a seller cannot name the full reference, treat that as a warning.

Tells on a counterfeit IWC

  • Dial print: font weight, letter spacing, and ink edges under a loupe. Copies show thicker strokes and uneven spacing.
  • Date wheel: numeral typeface and window position. Copies often sit off center or use a different font.
  • Caseback: engraving depth, reference number, serial number, and any medallion. Laser etching looks shallow and gray. Genuine engraving cuts deeper.
  • Crown: thread quality, logo relief height, and stem length.
  • Bezel: alignment at 12 o'clock, play in the rotation, and click feel.
  • Case finish: the line between brushed and polished surfaces should be sharp, not rounded.
  • Movement: rotor engraving, calibre stamp, and finishing. Copies often use an unmarked or wrongly numbered movement.

Recent replicas copy rotor engraving and calibre stamps. Decoration alone no longer separates real from fake. A watchmaker who opens the caseback and reads the movement is required.

What a check cannot prove

Photos, listed weight, and a loupe do not prove authenticity. Two copies from the same factory can differ. A seller's receipt can be forged. A box and papers set can be bought on its own. Treat every claim as unverified until a third party inspects the watch.

Prices and what they mean

Genuine IWC Aquatimer Automatic 42 models list in the mid four figures in USD at retail. Secondhand asking prices sit below that. Replica copies sell for a few hundred USD. A listing far below market is a replica, a stolen watch, or a watch with a replaced movement.

Steps before you pay

  1. Ask for the full reference, serial number, and the original box and papers.
  2. Ask IWC service or an authorized dealer to confirm the serial.
  3. Request a service quote. IWC service flags non-original parts.
  4. Pay with a method that allows a chargeback. Avoid wire transfers and gift cards.
  5. If the seller refuses a watchmaker inspection, stop.

If you want a replica instead

Replica sellers use the same reference numbers to label stock. The number on a replica listing does not mean the watch matches IWC specs. Case size, thickness, and movement differ from the genuine model. Expect no warranty and no service from IWC. Resale value is close to zero.