Answer first
Replica iw329172 is sold as a copy of an IWC Aquatimer Automatic. The number IW329172 does not appear in IWC's public reference list. Listings that use it describe a dive watch in the Aquatimer Automatic 42 mm family. Treat the number as a seller code, not a confirmed catalog reference.
What the genuine watch is
IWC's Aquatimer line is the company's dive watch range. The Automatic 42 mm model has a steel case, a 42 mm diameter, an internal rotating dive scale, sapphire crystal, and a screw-down crown. IWC rates it to 300 m. The movement is IWC calibre 32111. Retail price sits in the high four figures in US dollars.
Specs to compare against
- Case diameter: 42 mm
- Thickness: about 14 mm
- Water resistance: 300 m
- Crystal: sapphire, flat with a slight dome
- Bezel: rotating dive scale with the SafeDive linkage
What to check before buying
- Case photos with calipers on the lugs and caseback.
- A timegrapher screenshot for rate and amplitude.
- A video of bezel rotation, with sound.
- Macro shots of the dial text, date window, and lume.
- Caseback engraving depth and font.
Bezel and SafeDive
The SafeDive system links the inner dive scale to the outer bezel. Copies often fake this with a fixed decorative ring. Ask for a video of bezel rotation. Count the clicks. Note whether the inner scale moves with the outer ring.
Movement
Most copies use a Miyota 9015, a Seiko NH35, or a low-grade clone. The 9015 beats at 28,800 vph and hacks. The NH35 beats at 21,600 vph. A timegrapher photo shows rate and amplitude. Without one you buy blind.
Water resistance
ISO 6425 sets the test standard for dive watches. Most replica cases ship with no pressure test record. Do not swim with a replica until a watchmaker pressure tests it. Gaskets can arrive dry.
Dial and hands
Check the depth rating text, the IWC wordmark alignment, and lume application under magnification. Uneven lume and thick date fonts are the two common tells at arm's length.
Price and sourcing
Listings sit between about 200 and 600 USD. Price tracks movement grade and case finish. A seller who refuses caliper photos or timegrapher output is a stop signal.
What stays unknown
No public source confirms a factory name, production run, or serial pattern for iw329172. IWC does not publish replica data. Verify any claim of 1:1 construction with your own measurements.