What a fake IW329070 is
A fake IW329070 is a replica of the IWC Aquatimer Automatic 42, a 42 mm stainless steel dive watch. The genuine reference belongs to IWC's Aquatimer line, so it carries a rotating dive bezel with a lume pip at 12, a screw-down crown, a sapphire crystal, and a 300-meter water resistance rating. Replicas fall into two rough groups: cheap builds that copy the silhouette and nothing else, and higher-grade copies that install a Swiss or Japanese automatic calibre inside a decent case. Sorting one from the other takes a caliper, a loupe, and about ten minutes.
Genuine reference points to memorize
- Case: 42 mm stainless steel, brushed flanks with polished edges along the lugs.
- Water resistance: 300 m with a signed, screw-down crown.
- Crystal: sapphire with anti-reflective coating on the inner surface.
- Bezel: dive scale, firm click action, no backplay, lume pip aligned at 12.
- Strap: IWC rubber with a quick-change system and a signed buckle.
- Caseback: reference number, serial number, and model text cut at even depth.
How to inspect a suspected fake IW329070
- Pull the official specification for IW329070 from IWC before you touch the watch. Write down case diameter, thickness, lug width, water resistance, and movement family.
- Measure the case across the bezel with calipers and compare the number to the spec sheet. Replicas often run 1 to 2 mm wide or thick.
- Lay the watch dial up and watch the date change at midnight. Genuine movements snap over in minutes; cheap ones creep across the aperture for hours.
- Unscrew the crown and count the turns. A genuine crown engages in about two smooth rotations and carries crisp engraving on its face.
- Rotate the bezel through a full turn and listen. Count the clicks, push against the bezel to feel for backplay, and confirm the pip lands dead center at 12.
- Study the dial under a 10x loupe. Compare stroke weight and spacing on the brand logo, the model text, and the depth rating against a reference photo.
- Check the date aperture. Genuine windows are cut with sharp corners and the numeral sits centered in the frame.
- Sweep the seconds hand past each hour marker and look at the lume fill. Replica lume sits uneven inside the hands and often overflows the edges.
- Weigh the watch on a kitchen scale and compare to a genuine weight you have confirmed from a dealer or owner forum.
- Flex the rubber strap and release the quick-change mechanism. Genuine fittings click in and out with firm resistance and no rattle.
- Charge the dial under a lamp for 30 seconds, then move into a dark room. Compare brightness and how fast the glow fades.
- Hand the watch to a watchmaker and ask for the caseback to be opened. Photograph the rotor engraving, jewel count, and finish before anything is reassembled.
Movement and caseback checks
The caseback is where most replicas give themselves away. Genuine engraving is cut deep enough to catch a fingernail, and the reference and serial numbers sit in consistent positions with machine-cut edges. Replica engraving is often laser-etched, shallow, and slightly grainy under magnification. Inside, the rotor decoration, perlage on the bridges, and the lettering on the balance cock tell the same story. A watchmaker can confirm the calibre family in a minute.
Red flags when buying
- Seller refuses to provide a movement photo with the caseback open.
- Serial number does not match any record a dealer can confirm.
- Price sits far below the current market for a complete set with box and papers.
- Photos are stock images or show a different dial color than the listing text.
- Pressure testing is offered but water resistance claims are never documented.
Quick verification checklist
Match case diameter and thickness to the published spec, verify crown thread count and bezel click action, loupe the dial text and date window, confirm caseback engraving depth, weigh the watch, and open the caseback with a watchmaker. Any two failures together point to a replica rather than a genuine IW329070.