Answer first

IW323743 is an IWC reference. The 3237 block maps to the Ingenieur Automatic line, which IWC built in the 2000s and later dropped. I could not confirm IW323743 as a standalone catalog entry. It reads as a sub-variant of the IW3237 case. Replica sellers use the number because the original is out of production and few buyers can check it.

How IWC reference numbers break down

IWC prints references as IW plus digits. The first four digits name the family. The last digits name the dial, case metal, bracelet, or market variant.

  • IW3237: Ingenieur Automatic, stainless steel, 2000s production.
  • Trailing digits: finish and configuration codes.
  • Six-digit references cover older models. Current IWC references use eight digits, such as the 2023 Ingenieur Automatic 40.

Specs tied to the 3237 case

  • Case: stainless steel, about 42.5 mm across, about 14 mm thick.
  • Bracelet: integrated, tapering links, no end links.
  • Movement: IWC caliber 80110, automatic, Pellaton winding, 28,800 vph, 28 jewels, about 44 hours of power reserve.
  • Antimagnetic protection: soft-iron inner case. The line traces to the 1955 Ingenieur and the 1976 Genta design.
  • Water resistance: rated at 12 bar on the 3237 generation.

Published figures differ by generation. Check the caseback and the movement, not the listing text.

Where replica listings drift

  • Winding: the 80110 uses a Pellaton pawl system. Replica cases hold generic rotors or quartz.
  • Dial: date window position and font. The original sits at 3 o'clock, framed and printed.
  • Bracelet: link count and taper angle.
  • Caseback: engraving depth and font for reference and serial.
  • Weight: steel Ingenieur cases run heavy. Replicas often run light.

How to check a reference number

  1. Look up the number in IWC's own catalog or a reference database.
  2. Match the number to a dial and metal combination IWC listed.
  3. Compare the caseback engraving to photos of the same variant.
  4. Ask for movement photos with the caseback off.
  5. Treat new-old-stock claims for a discontinued line as unverified.

US legal position

Counterfeit watches are illegal to import and to sell in the United States. US Customs and Border Protection seizes shipments and destroys them. Trademark owners can file civil suits against sellers. Personal possession is treated apart from import and resale, but the sale side carries real exposure.