The short answer
IW329105 is an IWC reference number from the Aquatimer Automatic line, the 42 mm dive watch family IWC relaunched in 2014. People searching "fake iw329105" are usually asking one of two things: whether a watch they were offered under that reference is genuine, or whether replicas of it exist at all. Both get the same response from me. Yes, the reference is real. Yes, copies exist. And no, this is not one of the references that replica factories pour serious effort into, which changes what you should look for.
How to Buy Fake IW329105 Watches: A Comprehensive Guide
The Aquatimer is a working dive watch, not a dress piece, so the tells are mechanical more than cosmetic. A faker can print a dial well. Making an internal rotating bezel seal at 300 meters is harder.
What the genuine watch is
The Aquatimer Automatic 42 mm runs a self-winding IWC caliber 30120, which is an IWC-finished Sellita base, and it carries a 300 meter depth rating. The case is steel in most variants, the crystal is sapphire, and the crown screws down. The signature feature of the line is the internal rotating dive bezel, operated by a crown at the lower right of the case rather than an external ring. That bezel is the heart of the design and the heart of most authentication questions.
Reference numbers in this family change with dial color and strap or bracelet configuration. A reference ending in a different digit is a different dial or a different bracelet, not a different watch. That trips up a lot of buyers who assume a mismatched number means a fake.
How heavily is this reference copied
Less than you would think, and less than the Portugieser, the Big Pilot, or the Ingenieur. The Aquatimer's internal bezel is fiddly to replicate, the demand is narrower, and the margins sit lower than on a chronograph with an exhibition caseback. What does exist falls into two buckets: older generic dive watches with an IWC dial dropped in, and mid-tier copies that get the silhouette close and the bezel action wrong.
That matters for your expectations. A fake IW329105 is more likely to be a sloppy build than a superclone. Sloppy builds fail in obvious places.
Checks that actually work
Bezel feel and alignment
Turn the lower crown. On a real Aquatimer the internal bezel moves in crisp, defined increments with no mush and no backlash, and the triangle at twelve snaps into line with the marker. On copies the bezel often drifts, feels gritty, or sits a half degree off. Sometimes it moves when you flex the case, which means the seal is not doing its job.
Crown and case threads
Unscrew the main crown and feel the threads. Genuine IWC threads are cut clean and engage smoothly in two or three turns. Replicas frequently cross-thread, feel sharp, or need more turns than they should. Check the crown guards for machining marks that would never leave Schaffhausen.
Dial printing under magnification
Look at the IWC wordmark and the depth rating at six. Genuine printing is crisp and slightly raised, with no bleed at the edges. There is no excess lume spill around the applied indices, and the date window edges are square and chamfered. On copies the date sits slightly off-center and the lume pads are uneven.
Caseback engraving and serial
The Aquatimer caseback engraving is deep and clean, and the reference and serial numbers are consistent with the paperwork. A serial that does not match the card, or an engraving that looks laser-etched rather than stamped, is a stop sign. Also look for a caseback that does not sit flush after being opened and closed, which usually means someone has been inside it.
Movement and weight
A closed caseback means you cannot see the caliber, so you judge by behavior instead. Wind it and listen. The rotor should be quiet, the winding smooth, and the watch should hold a reserve in the high 30s to low 40s of hours. A 42 mm steel diver on a bracelet has real heft to it. Copies on hollow end links feel light and rattle at the clasp.
What a copy is worth versus what people pay
Mid-tier Aquatimer copies trade for a fraction of the genuine price, and the genuine watch itself sits in the used market well below retail. Run the math before you get excited. If someone offers an IW329105 at a price far under the used market, that price is the tell, not the watch. Nobody sells a real dive watch cheap out of generosity.
Questions to ask before money changes hands
- Ask for the full serial and compare it to the warranty card and any service record.
- Ask for a short video of the bezel being turned, not a still photo.
- Ask whether the bracelet is original to the watch and whether the quick-change system still works.
- Ask for the watch weighed on a scale, which is a fast way to catch a hollow-link copy.
- Ask a watchmaker to open it, or walk away. No exceptions on a dive watch that claims 300 meters.