Short answer

IW323746 is a code buyers search when they look at a replica IWC watch. IWC reference numbers use the pattern IW plus six digits. The digits point to a case, a caliber, and a dial. A photo of the code proves nothing. Check the reference on IWC's site, then compare the watch in hand against that listing.

Step 1: Match the code to a real reference

Search the six digits on iwc.com. IWC lists case size, movement, materials, and production years for its collections. If the code returns no match, the number came from a seller and not from the factory. Replica sellers borrow digit blocks from real references and change one or two numbers. A code that does not resolve is a signal, not proof. Ask the seller for a case back photo, the warranty card, and any service record.

Step 2: Check the movement

Genuine IWC watches use IWC manufacture calibers built in Schaffhausen, Switzerland. Replica cases hold ETA 2824 clones, Seagull ST21, Hangzhou 6460, or Miyota 9015 movements. Open the case back with a watchmaker and read the rotor engraving. A rotor marked IWC over a generic bridge set is a fake. Rate accuracy differs too: a stock clone drifts more than a regulated IWC caliber.

Step 3: Case, dial, and bracelet

  • Case back: reference and serial engraved with the same depth and spacing. Thin laser etching points to a copy.
  • Case size: within 0.3 mm of the published figure. Replica cases shift by 0.5 mm to 1 mm.
  • Dial: crisp text, aligned lume plots, date window centered in the aperture.
  • Bracelet: end links meet the case with no gap, screw lengths match, clasp engraving matches the reference.
  • Weight: put the watch on a scale and compare with the published spec for the reference.

Step 4: Papers and warranty

IWC ships with an international warranty. Watches sold from 2022 onward carry an 8-year warranty when the owner registers the piece in My IWC. The card lists the reference, the serial, and the dealer stamp. A card that names a reference with no match on iwc.com is counterfeit paperwork. Service invoices from an IWC boutique or an authorized service center confirm the serial. Call the service center to verify a serial before payment.

Step 5: Price

A 1:1 replica sells between $300 and $800. A used steel IWC chronograph trades for several thousand dollars. When a listing sits near the replica range and calls the watch genuine, the price is the first error. No seller takes a 90 percent loss on a real watch.

What the term 1:1 does not cover

The term 1:1 describes outside appearance in seller language. It does not cover the movement, the crystal coating, the gasket set, water resistance, or the lume. Replica dive watches often print 300 m on the dial and hold no pressure rating. Test any dive watch at a watchmaker before water contact.