Short Answer
IW329094 is an IWC reference number. IW3290 is the block IWC uses for the Ingenieur Automatic 42. The reference IW329094 does not appear in IWC's public catalog at the time of writing, and third-party listing data for it is thin. That does not prove the number is fake. It does mean a seller who quotes IW329094 has to show a matching case-back number, a movement photo and service papers. Without those, the reference stays unverified.
How IWC Reference Numbers Work
IWC uses the letters IW plus six digits. The first four digits set the model family and case. The last two set dial, metal or strap. One family holds many variants, so a number that looks new is not proof of a copy, and a number that looks known is not proof of a genuine watch.
Seven Checks on a Claimed IW329094
- Case-back engraving. The reference, case serial and material sit on the back. Compare font and spacing to IWC press photos. Refilled or laser-etched text sits shallow.
- Case diameter and thickness. Measure with calipers. Copies run 1 mm to 2 mm wide of the stated size and sit thicker on the wrist.
- Dial hardware. Applied markers on an Ingenieur sit flush and catch light in one direction. Printed or glued markers show a shadow line under raking light.
- Bezel and case finishing. Brushed surfaces run one way. Polished edges break at a crisp line. A copy shows rounded transitions.
- Movement. Ask for a photo of the calibre and the rotor engraving. A closed case back hides this, so a refusal to open the watch is a data point.
- Weight. Steel Ingenieur models weigh more than copies in the same size, because of the movement and the bracelet links.
- Papers and box. IWC service records carry the case serial. A serial that does not match the case back is a stop sign.
Price Signals
Ingenieur Automatic 42 retail sits in the five-figure range in US dollars. A street price far under resale for the same family points to a copy, a stolen watch or a scam. Sellers who ask for wire transfer or crypto and refuse a face-to-face handover remove your options after payment.
Legal Position in the US
Counterfeit watches are illegal to import and to sell in the United States. 18 U.S.C. 2320 covers trafficking in counterfeit goods, and US Customs can seize shipments. Buying a fake for personal use carries less exposure than selling one, but the item can still be seized. IWC will not service it, and there is no parts support.
Before You Pay
Get the case serial in writing. Ask for a timestamped photo of the case back next to a coin or a dated note. Run the serial through an IWC boutique or an authorized service center. For a private sale, meet at a watchmaker and pay for an authentication. That fee is small next to the cost of a bad watch.