Short answer

IW323771 is an IWC reference number. The prefix IW is IWC's own scheme. The four digits 3237 are the model block. The last two digits, 71, mark the dial, case metal, and strap variant. IWC lists the 3237 block in the Ingenieur Automatic line. A replica IW323771 is a third-party copy of that watch.

Replica listings for this reference sit between $250 and $600. The spread tracks the movement inside, not the case finish. Used genuine examples of the same generation list between $4,000 and $7,000 on dealer sites, based on condition, box, and papers. Any figure here is a market range, not a quote.

What the reference number tells you

  • IW: IWC factory numbering.
  • 3237: model block for the Ingenieur Automatic.
  • 71: variant code for dial color, case metal, and bracelet.

Public spec sheets for IW323771 are thin. IWC's own catalog is the source that lists diameter, metal, and calibre per variant. Ask the seller for the full variant digits and a photo of the caseback before you compare anything else. If the seller cannot name the variant, stop there.

The movement question

IWC calibres from this era use ETA ebauches. Calibre 30110 is a modified ETA 2892-A2. Sellers describe three tiers of copy movement: a stock 2892 clone, a decorated 2892 clone with IWC-style rotor engraving, and a low-grade 2824-type with a fake rotor plate.

The 2892 family beats at 28,800 vph and holds about 42 hours of reserve. A 21,600 vph rate or a 38-hour claim points to a cheaper base. Ask for a video of the seconds hand and a photo of the movement with the rotor and balance visible.

Inspection list

  1. Diameter and thickness. Measure with calipers. A listed 40 mm case often arrives at 40.5 mm.
  2. Dial text. IWC prints SCHAFFHAUSEN and AUTOMATIC at set sizes. On copies the letters crowd the date window or sit off center.
  3. Date wheel. Check the font, the alignment in the window, and the jump at midnight.
  4. Caseback engraving. Check depth and edge sharpness on the reference number and case number.
  5. Bracelet. Check end link fit, taper down the wrist, and clasp stamping.
  6. Crown. Check thread count and the relief of the logo.
  7. Lume. Charge both hands under a light for 30 seconds and compare brightness.
  8. Water resistance. A copy rated 100 m by a seller may fail a 3 bar pressure test.

Red flags

  • Stock catalog photos only. No images of the actual unit.
  • No movement photo. No video of the running watch.
  • A price far below the band for the movement tier claimed.
  • A claim that the watch holds a genuine IWC calibre. IWC does not sell loose calibres to third parties at volume.
  • Pressure to pay outside a platform with a dispute process.

Legal position in the US

US Customs can seize counterfeit watches at the border. Import and trafficking of counterfeit goods fall under 18 U.S.C. 2320. Each shipment carries that risk.