A fake IW329042 is a counterfeit copy of the IWC Aquatimer Automatic 42 mm. The real watch is a stainless steel dive watch with a 42 mm case, a screw-down crown, and a 300 m water resistance rating. Copies match the case shape and the dial print. They fail on the movement, the caseback engraving, the crown threads, and the pressure test.

What reference IW329042 covers

IWC groups the Aquatimer Automatic 42 under the 3290 reference block. Dial color, strap or bracelet, and limited editions change the last digits. IWC publishes a spec sheet for each number. Some online listings use numbers that do not appear in an IWC catalog. Compare the number against IWC records before you pay.

IWC reference lists change over time. If IW329042 does not match a current catalog entry, treat the listing as unverified.

Movement

The Aquatimer Automatic 42 runs on an IWC automatic calibre from the 30120 family, built on a Sellita SW300 base. That movement beats at 28,800 vph and holds about 42 hours of power reserve. Caseback type varies by variant, so check the spec sheet for the exact reference. Where the back is solid, the movement is not visible and a watchmaker has to open the case. Copies use a Miyota 9015, a Seagull, or an unbranded Chinese automatic with a plastic movement ring and no IWC stamp under the rotor.

Checks on the outside

  • Caseback engraving. Genuine IWC engraving has even depth and clean edges on the letters and numbers. Copies show shallow, rounded, or doubled lines. Reference number and serial sit in fixed positions.
  • Crown. The screw-down crown turns with light resistance and seats in about two turns without grit. Stripped or loose threads are common on copies.
  • Dial print. The IWC name and Schaffhausen line are crisp and sit at one height. Copies show thick or uneven ink.
  • Lume. Super-LumiNova glows blue-green and fades at an even rate. Cheap lume glows dim and dies in minutes.
  • Bezel. Check the click feel and the alignment of the triangle at 12 o'clock. Copies show a soft detent or a marker that sits off center.
  • Water resistance. A 300 m rating calls for a pressure test at 375 m under ISO 6425. Copies do not pass. Do not dive with one.

Weight, size, and finish

Case diameter and lug width are easy to copy. Weight and finish are harder. A 42 mm steel case on a steel bracelet has a heft that plated brass or thin steel does not match. Weight works as a check only when you compare against a known genuine watch on the same scale.

Paperwork and price

Genuine Aquatimer Automatic 42 watches sell on the secondary market in the low to mid four figures USD. Copies sell for a few hundred dollars. A listing at one tenth of market price is a fake or stolen goods. Boxes, cards, and manuals are copied, so paperwork proves nothing on its own. IWC service can verify a serial and a reference number.

If you own one

Have a watchmaker open the case and read the calibre markings. Ask for a pressure test. Counterfeit sales in the United States can be reported to U.S. Customs and Border Protection.