The Short Answer
Watches sold as the IWC IW328037 are not made by IWC. The number sits in IWC's 328xxx block, which IWC uses for the Pilot's Watch Automatic line. A copy shares the case shape and the dial layout. It does not share the movement, the crystal, or the price.
What the Reference Covers
IWC assigns 328xxx numbers to Pilot's Watch Automatic models. The Automatic 41 measures 41 mm across the case, about 11 mm thick, with a 20 mm lug width. The movement is IWC Caliber 32111, an automatic with a 120-hour power reserve. IWC builds that caliber at ValFleurier, a Richemont movement maker.
Version numbers inside the block change with dial color, strap, and case finish. Confirm the exact variant on IWC's site before you compare a watch to photos.
Case and Dial Checks
- Printing: "IWC" and "SCHAFFHAUSEN" sit under 12. On copies the letters are thick and the ink spreads at the edges.
- Crystal: sapphire with antireflective coating on both faces. Copies use mineral glass or coat one side. A blue or purple glare under a lamp points to a copy.
- Lume: Super-LumiNova on the hands and the numerals, applied in a flat layer. Copies use a raised, uneven layer that glows green.
- Crown: screw-down, signed. A crown that turns without threads is wrong.
- Date: the window sits at 3 o'clock. The numeral font should match the dial font.
Movement Tells
Caliber 32111 runs for 120 hours. A copy uses a Seagull, Miyota, or Hangzhou movement, or a decorated clone, and runs 38 to 42 hours. Test it. Wind the watch, set the time, and set it down for three days. A copy stops. A genuine watch keeps running.
Open the caseback if it has a display back. Bridges on the real caliber carry Geneva stripes and an IWC engraving. Copy bridges carry rough stripes and no engraving, or an engraving with a wrong font.
Price and Papers
Retail on a Pilot's Watch Automatic sits near $5,000 to $6,000 USD. Used examples trade below that. A listing at $300 to $900 for a "new" watch is a copy. Papers include a warranty card with a reference number and a serial. The serial on the card must match the serial on the caseback.
What Photos Miss
Many listings use photos of a genuine watch. Ask for a timestamped photo of the caseback, the crown side, and a running movement. Ask for a short video that shows the seconds hand and the date flipping. Sellers who refuse are selling copies.