Quick answer
A replica IW329170 is a third-party copy of an IWC Aquatimer-style diver. Buy one only after you confirm four things: the case matches the reference dimensions (about 42 mm wide and 14 mm thick), the bezel turns with firm detents instead of free play, the movement hacks and hand-winds without grinding, and the seller states in writing that the watch is not rated for diving. Treat every replica as a splash-resistant watch, not a dive instrument, and expect no manufacturer warranty.
Reference profile
IWC lists the Aquatimer line as its dive family, built around steel cases, internal rotating bezels, and automatic movements. Sellers of the IW329170 describe a 42 mm steel diver on rubber or a steel bracelet, with a screw-down crown, sapphire crystal, and a solid or display caseback. Use the published catalog figures as your measuring stick. Replicas rarely match thickness and lug-to-lug distance, and those two numbers decide how the watch actually sits on your wrist.
Before you start
- Digital calipers, a 10x loupe, and a soft cloth
- The seller's written specs: case width, thickness, lug width, movement name
- A return window of at least seven days, confirmed in writing
- A local watchmaker who will pressure-test a replica (many refuse)
How to inspect a replica IW329170
- Measure the case with calipers and compare width, thickness, and lug-to-lug to the reference figures.
- Check the lug width with a ruler; it should read 22 mm on this case size, not 20 or 21.
- Turn the bezel through a full rotation and count the detents; grit or back-play points to a weak ratchet spring.
- Unscrew the crown fully and inspect the threads under the loupe for cross-threading or burrs.
- Wind the watch 30 turns, then set the time and confirm the seconds hand hacks when the crown is pulled.
- Study the dial printing with the loupe; marker edges should be sharp, with no ink bleed or off-center text.
- Charge the lume with a phone light for 30 seconds and compare brightness and fade against photos of the genuine dial.
- Weigh the watch; a steel diver in this size class lands near 90 to 120 g on rubber, and a light case suggests plated alloy.
- Flex the strap or bracelet at the lugs and look for gaps at the end links.
- Request a pressure test before the return window closes, and skip swimming no matter the result.
Red flags
- A seller claiming 300 m water resistance with no test documentation.
- "Swiss made" on a case fitted with an Asian clone movement and no parts support.
- Photos that hide the caseback or the crown side.
- No return policy, or payment methods with no dispute route.
What a replica cannot do
No replica carries IWC's service network, spare parts, or warranty. Gaskets are the weak point: they dry, compress, and leak. Lume brightness fades within a couple of years. If the movement fails, a watchmaker may refuse the repair because the parts match no catalog. Budget for a full movement swap rather than a proper service.
Legal and practical notes
Counterfeit watches infringe trademarks, and customs agencies in the US and EU can seize shipments at the border. Selling a replica as genuine is a separate offense. Keep the purchase small, keep the receipts, and never resell a replica without labeling it as one. If you want a dive watch you can actually swim with, a mid-range Seiko, Citizen, or Orient diver costs less than a good replica and arrives with a warranty.