Short answer
IW329158 is an IWC reference inside the Aquatimer Automatic 42 mm line (IW3291xx). IWC does not list IW329158 on its public catalog pages at the time of writing, so confirm the case, dial and strap code with IWC or an authorized dealer before you compare a replica against it. Replica sellers use the number with little precision. Two shops can list "IW329158" and ship watches with different dials, different bezels and different movements.
Genuine spec, for comparison
- Case: stainless steel, 42 mm diameter, about 14.1 mm thick
- Movement: IWC caliber 32111, automatic, 120 hours power reserve, based on the Sellita SW300-1
- Bezel: rotating dive scale. IWC has used both an external ring and a coupled inner ring (SafeDive) across Aquatimer generations. Check which one applies to the reference you compare
- Crystal: sapphire with antireflective coating
- Water resistance: 300 m on the steel Aquatimer Automatic models
- Strap: rubber or steel bracelet with a quick-change system
The caliber 32111 runs for 120 hours after a full wind. That number drives most of the checks below.
What replica listings for this reference look like
Listings split into three price bands. The band tells you more about the watch than the reference number in the title.
- $80 to $200: mineral glass, printed dial, low-grade automatic or quartz, folded clasp
- $200 to $400: Miyota 9015 or a Chinese clone, sapphire crystal, screw-down crown, solid end links
- $400 to $800: Sellita SW200 or a decorated movement, closer case profile, better antireflective coating, laser-etched caseback text
No band matches a 120-hour reserve. A Miyota 9015 runs about 42 hours. A Sellita SW200 runs about 38 hours. Leave the watch on a desk for four days and the gap shows.
Checks that separate the bands
- Power reserve: wind the watch all the way, set the time, leave it for 72 hours. The genuine movement still runs.
- Bezel: count the clicks and check alignment at 12 o'clock. A dive bezel that drifts after one turn points to a plastic or thin metal click spring.
- Lume: charge the dial under a lamp for 30 seconds. Check brightness at 4 hours. Replica lume fades in under 2 hours in most cases.
- Caseback: compare font weight and spacing of the reference number and the serial. Engraving depth differs between bands.
- Size: measure with calipers. A 42 mm case, about 14 mm thick, plus the listed lug width. Replica cases run 0.5 mm to 1 mm off.
- Water resistance: get a pressure test before any contact with water. Gaskets on replica watches often fail at 3 to 5 bar.
Service and parts
IWC service centers do not work on replica watches, and they do not sell parts for them. If the movement is a Sellita SW200 or a Miyota 9015, an independent watchmaker can service it and source parts. If the movement is a decorated copy of a 32111, parts can be hard to find. Ask the seller for the movement name before you buy.
Price and legal status in the US
Genuine Aquatimer Automatic 42 mm watches sold new around $7,000 USD. Replica listings sit between $80 and $800. Selling counterfeit goods is illegal in the US under the Trademark Act, and 18 U.S.C. 2320 covers trafficking. CBP can seize counterfeit watches at the border, including shipments to a private address. A personal-use purchase can still end with a seizure and no refund from the seller.
What is not known
IWC's public catalog does not show IW329158. I do not have a verified dial, strap or bezel spec for that number. Confirm it with IWC before you treat any listing as a match. If a seller cannot state the movement name, the case diameter and the water resistance in writing, treat the listing as unverified.