Quick answer

A fake IW329050 is a counterfeit copy of an IWC Aquatimer Automatic 42, an automatic dive watch in a 42 mm steel case rated to 300 m. Most copies sell for USD 150 to USD 600. A genuine watch costs several times that on the used market. Copies fail on four points: movement beat rate, caseback engraving, bezel action, and weight.

What the IW329050 is

The reference sits in the IWC Aquatimer Automatic 42 family. Genuine specs: 42 mm stainless steel case, about 14 mm thick, 300 m water resistance, sapphire crystal with antireflective coating on both faces, and IWC calibre 30120, an automatic movement running at 28,800 vibrations per hour with about 42 hours of power reserve. The outer bezel drives an inner dive ring through a clutch system. The strap or bracelet uses IWC quick-change fittings, released by two pushers at the lugs.

Dial, strap, and bracelet variants differ by year and market. Confirm the exact configuration against IWC's own reference list before you treat a spec sheet as proof.

Where the copies come from

IWC is not a top target for the high-end replica factories that copy Rolex and Patek Philippe. Most IW329050 fakes come from mid-tier workshops in Guangzhou and are built on generic Chinese automatic movements. Common signs on arrival: 21,600 vph beat rate, no hacking seconds, a rotor with shallow engraving, and no movement serial number.

Checks that catch most fakes

1. Time the movement

Put the watch on a timegrapher or count the beats. Calibre 30120 runs at 4 Hz, so the seconds hand steps eight times per second. Copies at 21,600 vph step six times per second. A timegrapher reading of 21,600 or 28,800 with a rate error above 20 seconds per day points to a fake.

2. Read the caseback

Genuine engraving is deep and sharp. Reference number, serial number, and "International Watch Co." sit in fixed positions. Fakes show soft edges, uneven letter spacing, and a serial that does not match the paperwork. Genuine casebacks also carry the Aquatimer depth rating in a consistent font.

3. Turn the bezel

The genuine SafeDive bezel moves with light pressure, clicks in fixed steps, and the inner ring turns counterclockwise. Copies feel gritty, skip, or move the inner ring in both directions.

4. Check the crystal and dial

Genuine sapphire has antireflective coating on the inside and outside, so the dial reads black, not blue, under light. Many fakes have no inner coating and show a purple or blue cast. On the dial, check the applied IWC logo, the date font, and lume brightness after a 10-second charge with a phone light.

5. Weigh it

A 1 g kitchen scale will show a gap. Genuine steel Aquatimer Automatic 42 heads sit in a narrow weight band. Copies often come in light because the case is thinner and the movement is smaller.

6. Check the fittings

Genuine straps and bracelets release with two pushers at the lugs. Copies use spring bars and a tool, or a quick-release that binds.

Papers, boxes, and serial numbers

Fake sellers supply printed cards and boxes that look close to IWC packaging. The paper proves nothing by itself. Match the caseback serial to the movement serial, and match both to the warranty card. IWC can confirm a serial through an authorized service center. IWC service centers do not service counterfeit watches and return them unrepaired.

Price reality

Used steel Aquatimer Automatic 42 watches trade in the low four figures, about USD 3,000 to USD 5,000 depending on condition, box, and papers. A listing at USD 600 for a "new" watch is a fake. A listing at USD 3,200 with no box, no papers, and photos that avoid the caseback is a risk.

Legal position in the United States

Trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320. US Customs and Border Protection seizes counterfeit watches at import. Buying one for personal use is not the same charge as selling, but the shipment can be seized and destroyed with no refund. Trademark owners can also pursue civil claims under the Lanham Act.

If you already own one

Have an independent watchmaker open the case and read the movement. A written opinion costs about USD 75 to USD 200. That report is what you need for a chargeback or a dispute with a seller.