Short answer
A replica IW329137 is a counterfeit copy of an IWC Aquatimer Automatic. The number sits in the IWC 3291 family, which covers the Aquatimer Automatic 42. IWC does not publish every dial and strap code in its catalogs, so the exact configuration behind IW329137 is not confirmed in IWC material. Treat any listing that shows the number and no caseback photo as unverified.
The genuine reference
The Aquatimer Automatic 42 uses a 42 mm stainless steel case, an internal rotating bezel, and a 300 m water resistance rating. The movement is IWC caliber 30120, an automatic with a 42 hour power reserve. Secondary market prices for a genuine example sit near $3,500 to $6,000, based on condition, box, and papers. IWC Schaffhausen is owned by Compagnie Financiere Richemont.
What sellers advertise
- Case: 42 mm, with claims of 316L or 904L steel. Most replicas use 316L.
- Movement: Asian 2824 clone, Miyota 9015, or a "Swiss ETA" claim. A real Swiss ETA at a $300 price is rare.
- Water resistance: a 300 m claim copied from the spec sheet. Pressure ratings on replicas are claimed, not certified.
- Crystal: sapphire on mid and top tiers, mineral glass on budget units.
Price tiers
- Budget, $80 to $150. Mineral glass, stamped clasp, 21,600 vph movement.
- Mid, $250 to $450. Sapphire crystal, decorated rotor, 28,800 vph.
- Top, $500 to $800. Clone 2824, closer dial print, better bracelet end links.
Inspection points
- Dial print. Genuine IWC text holds a clean edge under 10x magnification. Replica print frays.
- Date wheel. Font weight and centering differ from the genuine part.
- Caseback engraving. Check cut depth and letter spacing.
- Bezel action. The internal bezel on the genuine watch turns with light friction. Replica bezels feel loose or grind.
- Lume. Genuine Super-LumiNova glows for hours. Replica lume fades in about 20 minutes.
- Water test. A replica that passes a 50 m static test is the exception.
Legal status in the US
Importing a counterfeit watch into the United States violates 18 U.S.C. 2320. A first offense carries up to 10 years in prison and a $2,000,000 fine for an individual. U.S. Customs and Border Protection seizes counterfeit goods at ports of entry and destroys them. The buyer can lose the item and face civil claims from the trademark owner.
What buyers get wrong
The reference number alone does not prove accuracy. IW329137 covers more than one dial and strap combination in the aftermarket, so two sellers can ship two different watches under the same listing. Movement claims are the largest gap. A listing that says Swiss movement at $300 does not deliver a Swiss-made movement. Water resistance is the second gap. A 300 m claim on a $300 watch is a marketing line, not a test result. Ask for a movement photo, a caseback photo, and a timegrapher reading before payment.