A fake IW329077 is a watch sold as IWC's Aquatimer reference IW329077 that did not come from IWC. Copies fall into three rough tiers: quartz or low-grade automatic builds, mid-tier replicas with a decorated but incorrect movement, and high-tier 1:1 builds that match the case geometry. The three checks that sort them fastest are the movement inside the case, the feel of the bezel, and the depth and font of the caseback engraving.
What a genuine IW329077 does
The reference sits in the IWC Aquatimer Automatic family. A real example carries a 42 mm stainless steel case, a screw-down crown, a sapphire crystal with anti-reflective coating on both faces, and a rotating dive bezel with IWC's SafeDive system. Water resistance is rated to 300 m. The engine is IWC calibre 30120, an automatic that runs at 28,800 vibrations per hour with about 42 hours of power reserve. Pull the current spec sheet from IWC before you compare, because this reference has shipped in more than one dial and strap configuration.
Tools to have on hand
- A 10x loupe or a phone macro lens
- Digital calipers
- A timegrapher or a beat-rate phone app
- The official spec page and a clear photo of a genuine caseback
Inspection order
- Measure the case across the 3 and 9 positions with calipers, then measure lug to lug.
- Turn the bezel through one full rotation and count the index steps by feel.
- Study the date window under the loupe and check the gap around the disc.
- Read the dial print at 10x and look for lume that sits above or below the applied indices.
- Flip the watch and read the caseback engraving for depth, font weight, and spacing.
- Have a watchmaker open the caseback and photograph the movement, rotor, and balance.
- Run the watch on a timegrapher for 24 hours across three positions.
- Pressure-test the case if the seller allows it.
The movement is the deciding check
Most low and mid-tier fakes hide a generic automatic or a quartz module behind a stamped rotor. Real calibre 30120 shows Geneva stripes, a signed rotor, and a balance that beats at 28,800 vph. A timegrapher reading of 21,600 vph points to a cheap Chinese automatic and ends the conversation. On high-tier copies the movement is often a Sellita SW300 base, which is close to the real thing, so judge those on case finishing, bezel tolerance, and crown thread quality instead.
Price reality and where copies appear
Genuine examples trade in the low to mid four figures in US dollars on the secondary market. Any listing far below that range, especially from a marketplace seller with stock photos and no service history, should be treated as a fake until proven otherwise. Copies also turn up in local classifieds and social media groups where returns are impossible.
Questions to ask a seller
- Can you send a photo of the movement with the caseback open?
- Do you have the original box, warranty card, and service paperwork?
- Will you accept a return if an independent watchmaker rejects it?
- What is the measured case width and lug to lug in millimeters?