Short answer
IW329097 is not a reference number IWC publishes. The company lists Aquatimer models in the IW3290 group, with variants such as IW3290-01. Variant 97 does not appear in that group. Listings that carry IW329097 come from replica sellers and marketplace accounts, not from an IWC catalog.
How IWC reference numbers work
IWC writes a reference as the letters IW plus six digits. The first four digits name the model family, the case, and the movement line. The last two digits mark the dial, the strap, and the case metal. IW329001 means family 3290, variant 01. A family ships with a small set of variants. It does not ship with 97 of them.
Why the number appears in search results
Three causes cover most cases. A seller copies digits from a photo and drops one. A seller invents a number to dodge a brand filter. A seller lists a real watch with a wrong number. Each one produces a page that no factory record supports.
Checks that prove nothing
- Listing photos. The seller picks the light and the angle.
- Box, papers, and hang tags. Print shops sell all three.
- The number in the listing title. Digits cost nothing to type.
- Caseback stickers. Replica sellers ship watches with film still on the back.
Checks that carry weight
- Search the reference on IWC's own site. No result means no model.
- Read the caseback engraving. IWC marks the reference, the case number, and the water resistance.
- Have a watchmaker open the case. The caliber and the rotor engraving must match the reference.
- Send the case number to an IWC boutique or service center. Staff confirm the production record.
The IW3290 family
IWC builds the Aquatimer Automatic 42 in the IW3290 group. The case measures 42 mm. Steel cases and rubber straps appear in the line. Replica sellers copy the case shape and the dial text. Copies of this line show up at $150 to $400.
Price signal
A used Aquatimer Automatic 42 trades for a few thousand US dollars. A listing at $200 for the same number is not that watch. Replica sellers price by the copy, not by the model.
When the number does not check out
Ask the seller for the caseback reference and the case number. Ask for a photo of the watch next to a dated note. Ask which service center handled the last service. If the answers do not match IWC records, treat the watch as unverified.