Short answer
"Fake IW329116 v4" is a search phrase from buyers who want a replica of an IWC watch. It has two parts. IW329116 is an IWC reference number. "v4" is a seller's version label. IWC does not use "v4". The replica trade does.
What IW329116 is
IWC reference numbers follow a fixed pattern: IW plus six digits. The leading digits point to a case family. The trailing digits point to a dial, strap, or finish variant inside that family. IW3291 sits in the Aquatimer line, IWC's dive watch family: a 42 mm steel case, 300 m rating, and an inner dive scale driven by the outer bezel.
IWC's online catalog does not list every reference the brand has made. If you cannot find IW329116 on iwc.com, that alone does not prove the watch is fake. Ask IWC or an authorized dealer to confirm the exact variant, dial color, and production years before you use that number to judge a replica.
What "v4" means in the replica market
Sellers number their batches. V1, v2, v3, v4. A new number signals a change: dial print, bezel insert, crystal height, caseback engraving, or movement. Buyers read a higher number as a fix for flaws in the prior batch.
No registry enforces this. Two sellers can ship different watches under the same "v4" label. A v4 from one factory is not the same watch as a v4 from another. Treat the label as a seller claim, not a specification.
Checks before you pay
- Case: 42 mm across, measured with calipers. Do not estimate from a photo.
- Dial: hour markers aligned to the minute track. Text weight matches the reference photo you were sent.
- Bezel: moves with clean detents, no back play, inner scale tracks the outer ring.
- Crystal: sapphire, flat, no distortion at the edge.
- Caseback: engraving depth. Laser-printed text sits flat and rubs off.
- Movement: rotor markings etched, not printed. Ask for a photo with the caseback off.
- Weight: a steel Aquatimer on a bracelet runs well above 150 g. A light watch means a thin case or a hollow bracelet.
Red flags in listings
- Stock photos only, no photo of the actual unit.
- "1:1" or "mirror quality" with no measurements attached.
- Price far under the rest of the market for the same version label.
- No water resistance test stated. Seals on a replica carry no rating, and a 300 m claim does not transfer from the genuine watch.
- One contact channel only, with no return terms in writing.
Legal note for US buyers
US law bars import of goods that carry a counterfeit protected trademark. CBP can seize the shipment, and the buyer has no way to recover the money. 19 CFR Part 133 covers the seizure rules. This applies to a single watch ordered for personal use.
Bottom line
"v4" tells you what a seller claims about a batch. It tells you nothing about the watch in the box. Ask for dated photos of the unit, caliper measurements, a movement photo, and return terms. If the seller cannot supply all four, skip it.