Short answer
A fake IW329105 is a Chinese-made copy of the IWC wristwatch that carries reference IW329105. Nothing about that number makes the replica special. What matters is which factory built it, which movement sits inside, and whether the case and dial match the real watch closely enough that nobody notices on a wrist. That is the whole game.
Start with the reference itself
IW329105 sits inside IWC's IW3291 block, and that block holds several dial and strap variants sharing one case. A seller can paste the wrong five-digit suffix and still show a photo that looks right. Before you judge any replica, confirm the reference on IWC's own site: case diameter, lug width, crown position, crystal shape, dial layout for that exact number. If the listing describes a 42 mm steel automatic and IWC shows something else, the seller is either careless or lying, and both are bad signs.
I have seen this go wrong in the other direction too. Some buyers hunt for a "fake IW329105" when the watch they actually want is a different suffix in the same family. The rep arrives, it is fine, it is just not the watch they thought they ordered.
What rep factories do with this class of watch
Steel IWC-style sports watches are easier to copy than a gold dress watch. No precious metal to fake, no hand finishing to hide behind. The tiers look like this:
- Budget ($80 to $150): mineral glass, stamped dial, a generic automatic or quartz inside. Fine in a listing photo, hollow in hand.
- Mid ($200 to $350): sapphire crystal, decent case finishing, a Miyota or Seagull automatic. Most buyers land here and this is where the value is.
- Top ($400 and up): cloned or heavily modified movement, correct crown action, dial printing that survives a loupe. Returns drop off fast past this point.
Checks that actually tell you something
- Crown threads. Screw it in and out ten times. Gritty action or cross-threading means a cheap tube, and water resistance is a joke.
- Dial text. Print should stay crisp under a phone macro lens. Fuzzy edges and uneven spacing are the giveaway on nearly every low tier rep.
- Date alignment. If the date sits off center in the window, the dial and movement were not made for each other.
- Weight and balance. Real steel has heft. If the watch feels light and hollow, the case is not what the listing claims.
- Lume. Charge it under a lamp for 30 seconds. Weak or patchy glow means cheap paint, and often a cheap dial overall.
What it costs to be wrong
Beyond the money, there is the legal side. Counterfeit watch trafficking gets prosecuted in the US as trademark infringement, and port seizures are routine. Buying one for yourself is low risk in practice. Reselling is a different story, and that is where people get in trouble.
Bottom line
A fake IW329105 is worth buying only when you know which reference you are copying, which factory made it, and what movement is inside. Skip listings that hide all three. A mid-tier rep with an honest spec sheet beats a "top tier" claim with no details every time.