Answer first

A fake IW329096 copies the IWC Aquatimer Automatic 42. The number IW329096 sits inside the IW3290 family. IWC lists IW329001 as the base Aquatimer Automatic 42: 42 mm steel case, 300 m water resistance, calibre 30120, 42-hour power reserve. A watch sold as IW329096 with a 40 mm case, a printed caseback, or a generic movement is not genuine.

IWC does not publish a public spec page for every dial and strap variant. The exact trim of IW329096 is not confirmed in open sources. Send the reference and the serial to an IWC boutique or service center before you buy.

Case and caseback checks

  • Diameter: 42 mm. Copies measure 40 mm to 41 mm.
  • Caseback: engraving of the reference, the serial, and the IWC mark. The cut is deep and clean. Fakes show shallow acid etch or laser burn.
  • Serial: 6 to 8 digits, unique to the watch. A blank serial or a serial that repeats across listings means a fake.
  • Crown: screw-down, signed, with crisp threads. Fake threads strip in months.
  • Crystal: sapphire. Mineral glass on a watch sold as IW329096 is a fake.

Movement

Genuine IW3290 watches run IWC calibre 30120: automatic, 28,800 vph (4 Hz), 42-hour power reserve, date at 3 o'clock. Fakes fit a Miyota 9015 or a Seagull ST21. Both beat at 28,800 vph, so the beat rate alone does not prove a fake. A watchmaker can open the caseback and read the rotor engraving, the balance cock finish, and the calibre stamp.

Serial and reference check

  1. Photograph the caseback in daylight.
  2. Read the reference and the serial.
  3. Send both to IWC service or a boutique.
  4. Ask the seller for the warranty card, the box, and the service record.
  5. Compare the caseback font to photos of a confirmed genuine IW3290.

Price reality

Used Aquatimer Automatic 42 watches trade in the $3,500 to $5,500 range on the secondary market. An IW329096 offer at $300 to $800 is a replica listing. A seller who calls that watch genuine is misrepresenting the goods. Import of counterfeit watches is illegal in the United States.

Common listing tricks

  • Genuine photos from an auction site, with a different watch shipped.
  • Caseback photos that are cropped or blurred.
  • IW329096 in the title with no serial number in the text.
  • Pressure to pay by wire or gift card.